執(zhí)行標準：GB/T4989-94及JB/T7495-94 |
一、型號說明： |
1、其它型號補償導線如：KC、JX、SC、EX、NC、TX等，只需改寫型號的*項，如：EX-G-VV、TX-H-FVP等；
2、需導體為多股軟芯時，應在原型號后加“R”表示，如：TX-G-VVPR；
3、還可根據(jù)需要提供聚乙烯（Y）絕緣、交聯(lián)聚乙烯（YJ）絕緣補償電纜。
4、補償電纜屏蔽層也可采用金屬帶繞包形式，如：復合鋁帶（P3）、復合銅帶（P2）；
5、需阻燃型補償電纜，應在原型號前加“ZR-”。
6、需鎧裝型補償電纜，應在原型號后加“-22”表示鋼帶鎧裝；加“-32”表示鋼絲鎧裝。 |
二、產(chǎn)品資料： |
全稱：聚氯乙烯絕緣和護套一般用精密級K分度熱電偶用補償導線 導體材質(zhì): 正極為鎳鉻----負極為鎳硅 熱電偶分度號K型 絕緣材料：氟塑料絕緣 顏色：正極為紅色 負極為黑色 護套材料：氟塑料護套 顏色：灰色 溫度：-20--70 可根據(jù)需要提供聚乙烯（Y）絕緣、 交聯(lián)聚乙烯（YJ）絕緣補償電纜。 絕緣電阻: 25MΩ.km 電壓試驗：1000 V/1min 阻燃性能：符合GB/T18380-2001阻燃標準中A、 B、 C類規(guī)定 熱電動勢及允差：精密級 8137 ±60（±1.5℃） |
三、規(guī)格參數(shù) |
規(guī)格 | A類導體 | R類導體 | 20℃時往復電阻值 ≤Ω/m | 2×0.5 mm² | 1/0.80 | 7/0.30 | 2.20 | 2×1.0 mm² | 1/1.13 | 7/0.43 | 1.10 | 2×1.5 mm² | 1/1.37 | 7/0.52 | 0.73 | 2×2.5 mm² | 1/1.76 | 19/0.41 | 0.44 |
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四、導體參數(shù)： |
產(chǎn)品型號 | 補償導線及電纜線芯 | 補償導線絕緣層著色 | 配用熱電偶分度號 | 正極 | 負極 | 正極 | 負極 | SC or RC | 銅 | 銅鎳0.6 | 紅 | 綠 | S（鉑銠10-鉑）或 R（鉑銠13-鉑） | KCA | 鐵 | 銅鎳22 | 紅 | 藍 | K（鎳鉻-鎳硅） | KCB | 銅 | 銅鎳40 | 紅 | 藍 | KX | 鎳鉻10 | 鎳硅3 | 紅 | 黑 | EX | 鎳鉻10 | 銅鎳45 | 紅 | 棕 | E（鎳鉻-銅鎳） | JX | 鐵 | 銅鎳45 | 紅 | 紫 | J（鐵-銅鎳） | TX | 銅 | 銅鎳45 | 紅 | 白 | T（銅-銅鎳） | NC | 鐵 | 銅鎳18 | 紅 | 灰 | N（鎳鉻硅-鎳硅） |
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五、熱電特性及允差 |
型號 | 使用分類 | 導線溫度范圍℃ | 熱電動勢及允差μV | 熱電偶測量端 溫度℃ | 20℃時往復電阻值 ≤Ω/m | 熱電勢 | 精密度 | 普通級 | 0.5mm2 | 1.0 mm2 | 1.5 mm2 | SC&RC | G | 0~100 | 646 | ±30（±2.5℃） | ±60（±5.0℃） | 1000 | 0.10 | 0.05 | 0.03 | 0.02 | H | 0~200 | 1440 | / | ±60（±5.0℃） | KCA | G | 0~100 | 4095 | ±60（±1.5℃） | ±100（±2.5℃） | 1.40 | 0.70 | 0.47 | 0.28 | H | 0~200 | 8137 | 900 | KCB | G | 0~100 | 4095 | 1.04 | 0.52 | 0.35 | 0.21 | KX | G | -20~100 | 4095 | 2.20 | 1.10 | 0.73 | 0.44 | H | -25~200 | 8137 | EX | G | -20~100 | 6137 | ±120（±1.5℃） | ±200（±2.5℃） | 500 | 2.50 | 1.25 | 0.83 | 0.50 | H | -25~200 | 13419 | JX | G | -20~100 | 5268 | ±85（±1.5℃） | ±140（±2.5℃） | 1.30 | 0.65 | 0.43 | 0.26 | H | -25~200 | 10777 | TX | G | -20~100 | 4277 | ±30（±0.5℃） | ±60（±1.0℃） | 300 | 1.04 | 0.52 | 0.35 | 0.21 | H | -25~200 | 9285 | ±48（±0.8℃） | ±90（±1.5℃） | NC | G | 0~100 | 2774 | ±60（±1.5℃） | ±100（±2.5℃） | 900 | 1.50 | 0.75 | 0.50 | 0.30 | H | 0~200 | 5912 | NX | G | -20~100 | 2774 | 2.86 | 1.43 | 0.95 | 0.57 | H | -25~200 | 5912 |
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六、規(guī)格重量： |
芯數(shù)×標稱 截面mm2 | 導體 種類 | zui大外徑mm | 計算重量kg/km | VV | VPV | FF | FP1F | VV | VPV | FF | FP1F | 2×0.5 | A | 3.7×6.4 | 4.7×7.4 | 2.6×4.6 | 3.2×5.2 | 30 | 50 | 27 | 45 | R | 3.9×6.6 | 4.9×7.6 | 2.8×4.8 | 3.4×5.4 | 35 | 55 | 30 | 50 | 2×1.0 | A | 5.0×7.7 | 6.0×8.7 | 3.0×5.3 | 3.6×5.9 | 56 | 82 | 39 | 64 | R | 5.1×8.0 | 6.1×9.0 | 3.1×5.6 | 3.7×6.2 | 60 | 87 | 45 | 69 | 2×1.5 | A | 5.2×8.3 | 6.2×9.3 | 3.2×5.8 | 3.8×6.4 | 68 | 93 | 54 | 77 | R | 5.5×8.7 | 6.5×9.7 | 3.4×6.2 | 4.0×6.8 | 75 | 102 | 60 | 87 | 2×2.5 | A | 5.7×9.3 | 6.7×10.3 | 3.6×6.7 | 4.2×7.3 | 94 | 121 | 77 | 103 | R | 5.9×9.8 | 6.9×10.8 | 4.0×7.3 | 4.6×7.9 | 101 | 133 | 84 | 114 | 芯數(shù)×標稱 截面mm2 | 導體 種類 | zui大外徑mm | 計算重量kg/km | VV | VPV | FV | FP1V | FF | FP1F | VV | VPV | FV | FP1V | FF | FP1F | 1×2×0.5 | A | 6.9 | 7.4 | 6.7 | 7.2 | 5.0 | 5.6 | 58 | 70 | 49 | 68 | 36 | 53 | R | 7.3 | 7.7 | 7.0 | 7.4 | 5.2 | 5.8 | 59 | 73 | 52 | 73 | 38 | 56 | 1×2×1.0 | A | 8.7 | 9.1 | 7.4 | 7.8 | 5.8 | 6.3 | 87 | 107 | 64 | 86 | 50 | 70 | R | 8.9 | 9.4 | 7.6 | 8.3 | 6.1 | 6.8 | 94 | 113 | 70 | 95 | 54 | 80 | 1×2×1.5 | A | 9.1 | 9.8 | 7.9 | 8.4 | 6.4 | 6.9 | 104 | 125 | 78 | 103 | 62 | 89 | R | 9.6 | 10.5 | 8.1 | 8.8 | 6.6 | 7.4 | 109 | 131 | 83 | 110 | 72 | 95 | 1×2×2.5 | A | 10.0 | 10.7 | 8.8 | 9.2 | 7.4 | 7.8 | 129 | 153 | 106 | 133 | 92 | 117 | R | 10.7 | 11.3 | 9.2 | 10.1 | 7.8 | 8.7 | 143 | 179 | 113 | 144 | 99 | 126 | 2×2×0.5 | A | 10.3 | 11.4 | 9.4 | 11.1 | 7.9 | 9.7 | 107 | 177 | 93 | 175 | 79 | 156 | R | 10.6 | 12.0 | 9.5 | 11.4 | 8.1 | 10.0 | 115 | 186 | 98 | 183 | 84 | 164 | 2×2×1.0 | A | 13.0 | 15.0 | 10.5 | 12.2 | 9.0 | 11.0 | 175 | 282 | 128 | 220 | 112 | 207 | R | 13.3 | 15.4 | 10.9 | 12.9 | 9.5 | 11.7 | 177 | 293 | 135 | 236 | 120 | 221 | 2×2×1.5 | A | 13.6 | 16.1 | 11.3 | 13.1 | 9.9 | 11.9 | 197 | 314 | 153 | 257 | 137 | 240 | R | 15.1 | 16.8 | 11.9 | 14.4 | 10.7 | 13.0 | 226 | 338 | 174 | 294 | 158 | 277 | 2×2×2.5 | A | 15.8 | 17.5 | 12.8 | 15.2 | 11.6 | 13.6 | 277 | 388 | 211 | 346 | 198 | 325 | R | 16.8 | 18.6 | 13.6 | 16.6 | 12.4 | 15.1 | 302 | 449 | 239 | 383 | 238 | 360 | 3×2×0.5 | A | 10.6 | 12.1 | 9.8 | 11.7 | 8.4 | 10.5 | 122 | 212 | 105 | 206 | 91 | 193 | R | 11.2 | 12.7 | 10.0 | 12.1 | 8.6 | 10.9 | 134 | 220 | 110 | 210 | 96 | 204 | 3×2×1.0 | A | 14.4 | 15.8 | 11.0 | 13.0 | 9.6 | 11.8 | 217 | 336 | 156 | 272 | 139 | 254 | R | 14.7 | 16.3 | 11.6 | 13.6 | 10.3 | 12.4 | 232 | 356 | 170 | 291 | 155 | 273 | 3×2×1.5 | A | 15.2 | 17.1 | 12.0 | 14.5 | 10.8 | 13.0 | 264 | 387 | 195 | 337 | 181 | 317 | R | 16.0 | 17.8 | 12.5 | 15.3 | 11.3 | 13.8 | 278 | 411 | 214 | 362 | 198 | 344 | 3×2×2.5 | A | 16.7 | 18.6 | 13.5 | 16.1 | 12.3 | 14.5 | 338 | 485 | 273 | 434 | 256 | 412 | R | 17.9 | 19.8 | 15.2 | 17.6 | 13.6 | 16.1 | 369 | 553 | 314 | 466 | 295 | 446 | 4×2×0.5 | A | 11.3 | 12.9 | 10.5 | 13.5 | 9.0 | 12.3 | 151 | 252 | 133 | 254 | 113 | 236 | R | 12.0 | 14.5 | 10.7 | 14.7 | 9.2 | 13.2 | 160 | 283 | 139 | 265 | 172 | 248 | 4×2×1.0 | A | 15.4 | 16.9 | 11.8 | 15.6 | 10.6 | 14.1 | 262 | 410 | 187 | 342 | 185 | 322 | R | 16.2 | 17.4 | 12.4 | 16.6 | 11.2 | 15.1 | 271 | 418 | 201 | 368 | 218 | 346 | 4×2×1.5 | A | 16.3 | 18.3 | 12.9 | 16.8 | 11.7 | 15.3 | 309 | 462 | 235 | 405 | 250 | 383 | R | 18.3 | 19.1 | 13.5 | 17.8 | 12.3 | 16.3 | 330 | 487 | 270 | 431 | 327 | 408 | 4×2×2.5 | A | 18.0 | 20.6 | 14.5 | 18.8 | 13.6 | 17.3 | 404 | 612 | 348 | 521 | 355 | 497 | R | 19.3 | 21.9 | 16.3 | 21.5 | 14.7 | 19.7 | 440 | 691 | 377 | 566 | 146 | 540 | 5×2×0.5 | A | 12.7 | 15.0 | 11.7 | 14.4 | 10.5 | 12.5 | 183 | 321 | 158 | 322 | 214 | 302 | R | 13.4 | 15.8 | 11.9 | 14.9 | 10.7 | 13.6 | 196 | 343 | 172 | 337 | 251 | 319 | 5×2×1.0 | A | 17.3 | 18.9 | 13.1 | 16.1 | 11.9 | 14.5 | 318 | 485 | 230 | 410 | 288 | 392 | R | 18.0 | 19.4 | 14.5 | 16.9 | 13.0 | 15.4 | 334 | 504 | 269 | 448 | 311 | 423 | 5×2×1.5 | A | 18.3 | 21.0 | 15.1 | 17.2 | 13.5 | 15.6 | 383 | 591 | 300 | 492 | 411 | 468 | R | 19.3 | 22.0 | 15.8 | 18.2 | 14.3 | 16.6 | 405 | 624 | 332 | 524 | 453 | 499 | 5×2×2.5 | A | 20.9 | 23.0 | 17.1 | 19.1 | 15.5 | 17.6 | 531 | 750 | 434 | 640 | 411 | 612 | R | 22.3 | 24.5 | 18.3 | 21.8 | 16.7 | 20.0 | 574 | 848 | 473 | 726 | 453 | 696 | 5×2×0.5 | A | 15.0 | 16.8 | 13.2 | 16.3 | 12.0 | 14.7 | 234 | 384 | 195 | 385 | 178 | 361 | R | 15.8 | 17.7 | 13.5 | 16.8 | 12.3 | 15.3 | 250 | 410 | 209 | 406 | 192 | 383 | 6×2×1.0 | A | 19.7 | 22.1 | 15.5 | 18.0 | 14.0 | 16.5 | 382 | 609 | 304 | 503 | 283 | 473 | R | 20.9 | 22.8 | 16.5 | 19.1 | 15.0 | 17.6 | 433 | 643 | 326 | 539 | 303 | 507 | 6×2×1.5 | A | 21.5 | 23.9 | 17.1 | 19.5 | 15.5 | 17.9 | 492 | 703 | 363 | 592 | 352 | 562 | R | 22.7 | 25.1 | 18.0 | 21.2 | 16.5 | 19.5 | 521 | 756 | 405 | 659 | 381 | 634 | 6×2×2.5 | A | 23.9 | 26.6 | 19.4 | 22.4 | 17.8 | 20.7 | 641 | 870 | 527 | 798 | 502 | 767 | R | 25.5 | 28.4 | 21.6 | 24.8 | 19.8 | 23.0 | 697 | 1048 | 603 | 870 | 573 | 836 | 7×2×0.5 | A | 15.2 | 17.1 | 13.4 | 16.5 | 12.2 | 15.0 | 248 | 413 | 207 | 411 | 187 | 388 | R | 16.1 | 17.9 | 14.4 | 17.0 | 12.9 | 15.5 | 260 | 435 | 235 | 436 | 215 | 408 | 7×2×1.0 | A | 20.7 | 22.4 | 15.8 | 18.2 | 14.3 | 16.7 | 429 | 650 | 318 | 531 | 296 | 505 | R | 21.2 | 23.1 | 16.8 | 19.4 | 15.3 | 17.9 | 445 | 675 | 341 | 572 | 318 | 545 | 7×2×1.5 | A | 21.9 | 24.3 | 17.3 | 19.7 | 15.7 | 18.2 | 514 | 750 | 398 | 631 | 375 | 606 | R | 23.0 | 25.4 | 18.3 | 21.5 | 16.7 | 19.8 | 537 | 796 | 426 | 704 | 402 | 672 | 7×2×2.5 | A | 24.2 | 27.1 | 19.7 | 22.7 | 18.2 | 21.0 | 676 | 971 | 562 | 857 | 535 | 825 | R | 26.0 | 28.8 | 21.9 | 25.2 | 20.1 | 23.4 | 727 | 1113 | 637 | 932 | 607 | 897 | 8×2×0.5 | A | 16.5 | 18.5 | 15.2 | 17.8 | 13.6 | 16.3 | 279 | 464 | 245 | 400 | 228 | 435 | R | 17.5 | 19.5 | 15.6 | 18.5 | 14.1 | 16.9 | 294 | 485 | 263 | 483 | 242 | 457 | 8×2×1.0 | A | 22.4 | 24.4 | 17.2 | 19.8 | 15.6 | 18.3 | 480 | 730 | 357 | 595 | 333 | 568 | R | 23.1 | 25.1 | 18.3 | 21.8 | 16.7 | 20.0 | 490 | 759 | 380 | 671 | 360 | 640 | 8×2×1.5 | A | 23.8 | 26.8 | 18.8 | 22.1 | 17.3 | 20.4 | 574 | 840 | 450 | 741 | 426 | 710 | R | 25.1 | 28.2 | 20.6 | 23.4 | 18.8 | 21.7 | 604 | 922 | 508 | 792 | 480 | 760 | 8×2×2.5 | A | 26.8 | 29.5 | 22.1 | 24.8 | 20.4 | 23.0 | 786 | 1089 | 663 | 968 | 634 | 934 | R | 28.8 | 31.5 | 23.9 | 27.8 | 22.4 | 25.4 | 844 | 1250 | 718 | 1074 | 686 | 1046 | 9×2×0.5 | A | 17.3 | 19.5 | 16.0 | 18.7 | 14.4 | 17.2 | 300 | 509 | 273 | 503 | 252 | 478 | R | 18.4 | 21.1 | 16.4 | 19.5 | 14.9 | 17.9 | 321 | 559 | 288 | 530 | 266 | 505 | 9×2×1.0 | A | 23.7 | 25.7 | 18.0 | 21.5 | 16.5 | 19.7 | 527 | 802 | 391 | 680 | 369 | 651 | R | 24.3 | 26.8 | 19.3 | 22.9 | 17.7 | 21.1 | 542 | 859 | 423 | 735 | 398 | 703 | 9×2×1.5 | A | 25.1 | 28.3 | 19.8 | 23.2 | 18.2 | 21.5 | 633 | 955 | 497 | 816 | 472 | 783 | R | 27.0 | 29.7 | 21.7 | 24.6 | 19.9 | 22.9 | 686 | 1010 | 560 | 866 | 530 | 837 | 9×2×2.5 | A | 28.3 | 31.1 | 23.3 | 26.5 | 21.6 | 24.3 | 866 | 1201 | 734 | 1091 | 703 | 1064 | R | 30.5 | 33.2 | 25.2 | 29.4 | 23.4 | 26.8 | 932 | 1423 | 795 | 1186 | 761 | 1157 | 10×2×0.5 | A | 17.5 | 19.5 | 16.1 | 18.8 | 14.5 | 17.3 | 324 | 541 | 293 | 540 | 271 | 514 | R | 18.5 | 21.2 | 16.5 | 19.6 | 15.0 | 17.9 | 346 | 599 | 310 | 570 | 287 | 543 | 10×2×1.0 | A | 23.8 | 25.8 | 18.1 | 21.6 | 16.6 | 19.8 | 566 | 862 | 423 | 735 | 400 | 701 | R | 24.5 | 26.9 | 19.4 | 23.0 | 17.8 | 21.1 | 584 | 922 | 458 | 791 | 433 | 758 | 10×2×1.5 | A | 25.2 | 28.4 | 19.8 | 23.3 | 18.2 | 21.6 | 684 | 1027 | 538 | 878 | 514 | 844 | R | 27.1 | 29.8 | 21.8 | 24.7 | 20.0 | 22.9 | 742 | 1085 | 606 | 934 | 575 | 903 | 10×2×2.5 | A | 28.5 | 31.2 | 23.4 | 26.6 | 21.7 | 24.4 | 941 | 1296 | 797 | 1180 | 767 | 1152 | R | 30.6 | 33.3 | 25.3 | 29.5 | 23.5 | 26.8 | 1009 | 1536 | 863 | 1279 | 827 | 1250 | 12×2×0.5 | A | 18.5 | 21.5 | 17.1 | 20.7 | 15.5 | 18.9 | 372 | 641 | 336 | 636 | 313 | 617 | R | 19.7 | 22.6 | 17.6 | 21.5 | 16.1 | 19.7 | 396 | 680 | 354 | 681 | 332 | 650 | 12×2×1.0 | A | 25.2 | 27.5 | 19.4 | 23.0 | 17.8 | 21.2 | 647 | 1014 | 490 | 843 | 465 | 811 | R | 26.5 | 28.7 | 21.3 | 24.4 | 19.6 | 22.7 | 697 | 1054 | 557 | 908 | 526 | 874 | 12×2×1.5 | A | 27.3 | 30.1 | 21.9 | 24.9 | 20.1 | 23.1 | 812 | 1191 | 655 | 1014 | 625 | 980 | R | 28.8 | 31.8 | 23.2 | 26.8 | 21.5 | 25.1 | 856 | 1254 | 700 | 1119 | 668 | 1091 | 12×2×2.5 | A | 30.4 | 33.3 | 25.0 | 28.4 | 23.2 | 26.2 | 1086 | 1541 | 929 | 1367 | 896 | 1339 | R | 32.7 | 35.6 | 26.5 | 31.5 | 25.9 | 28.9 | 1167 | 1767 | 1030 | 1404 | 1011 | 1455 | 14×2×0.5 | A | 20.6 | 22.9 | 18.3 | 22.1 | | | 420 | 736 | 380 | 732 | | | R | 21.9 | 24.2 | 18.9 | 22.9 | | | 473 | 770 | 401 | 769 | | | 14×2×1.0 | A | 27.7 | 30.1 | 21.5 | 24.6 | | | 763 | 1161 | 588 | 960 | | | R | 28.6 | 30.9 | 22.9 | 26.7 | | | 792 | 1199 | 634 | 1061 | | | 14×2×1.5 | A | 29.4 | 32.6 | 23.5 | 27.2 | | | 925 | 1379 | 749 | 1183 | | | R | 31.0 | 34.2 | 25.0 | 28.8 | | | 975 | 1459 | 801 | 1266 | | | 14×2×2.5 | A | 32.8 | 35.9 | 27.2 | 30.5 | | | 1241 | 1762 | 1090 | 1564 | | | R | 35.2 | 38.8 | 28.7 | 33.8 | | | 1335 | 2063 | 1180 | 1734 | | | 16×2×0.5 | A | 21.5 | 23.9 | 19.0 | 23.0 | | | 501 | 820 | 427 | 815 | | | R | 22.8 | 25.2 | 19.7 | 23.9 | | | 528 | 860 | 453 | 861 | | | 16×2×1.0 | A | 28.9 | 31.4 | 22.3 | 25.6 | | | 855 | 1300 | 663 | 1075 | | | R | 29.8 | 32.2 | 23.9 | 27.8 | | | 893 | 1380 | 715 | 1186 | | | 16×2×1.5 | A | 30.7 | 34.0 | 24.5 | 28.3 | | | 1050 | 1546 | 845 | 1328 | | | R | 32.5 | 35.8 | 26.5 | 30.0 | | | 1100 | 1648 | 927 | 1418 | | | 16×2×2.5 | A | 34.2 | 38.0 | 28.5 | 31.8 | | | 1408 | 1982 | 1237 | 1796 | | | R | 36.7 | 40.6 | 30.9 | 35.3 | | | 1516 | 2326 | 1341 | 1956 | | | 19×2×0.5 | A | 23.2 | 25.7 | 21.2 | 24.9 | | | 571 | 936 | 517 | 934 | | | R | 24.6 | 27.6 | 22.0 | 25.7 | | | 598 | 1005 | 546 | 985 | | | 19×2×1.0 | A | 31.4 | 34.0 | 24.2 | 28.0 | | | 978 | 1528 | 758 | 1263 | | | R | 32.9 | 34.9 | 25.9 | 30.0 | | | 1008 | 1577 | 818 | 1361 | | | 19×2×1.5 | A | 33.3 | 36.9 | 27.0 | 30.6 | | | 1193 | 1773 | 998 | 1528 | | | R | 35.8 | 39.3 | 28.7 | 32.5 | | | 1254 | 1920 | 1065 | 1665 | | | 19×2×2.5 | A | 37.2 | 41.2 | 30.9 | 34.4 | | | 1615 | 2317 | 1420 | 2072 | | | R | 40.5 | 44.1 | 33.6 | 38.7 | | | 1763 | 2677 | 1543 | 2284 | | | | | | | | | | | | | | | | | | | |
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我公司生產(chǎn)：鉑銠熱電偶，S型鉑銠熱電偶，B型鉑銠熱電偶，WRP-130熱電偶，B型熱電偶，單鉑銠熱電偶，WRR-B型鉑銠熱電偶，雙鉑銠熱電偶，S分度熱電偶，K型熱電偶，S型熱電偶，防爆熱電偶，防腐熱電偶，鎧裝熱電偶，熱電偶測溫儀，裝配熱電偶，B分度熱電偶，煙斗熱電偶，鋼水測溫儀，手持式鋼水測溫儀，手持式熱電偶等
產(chǎn)品型號： 
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