1.?是(shi)(shi)指(zhi)耐(nai)溫(wen)(wen)(wen)(wen)(wen)(wen)等(deng)級(ji)，-40℃應該(gai)是(shi)(shi)環(huan)境的(de)(de)(de)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)。 2.?額(e)定溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)意(yi)(yi)思是(shi)(shi)在該(gai)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)之內，電阻可以(yi)(yi)正常(chang)運作，阻值(zhi)不(bu)會發生(sheng)改(gai)變(bian)，但是(shi)(shi)超(chao)出這個(ge)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)的(de)(de)(de)話，它的(de)(de)(de)阻值(zhi)就會隨著溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)改(gai)變(bian)而改(gai)變(bian)。UL 80? 105? GB 70? 90意(yi)(yi)思都是(shi)(shi)一(yi)樣，表示(shi)該(gai)線(xian)(xian)材(cai)使(shi)(shi)用(yong)(yong)環(huan)境溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)是(shi)(shi)在額(e)定條件下，超(chao)過此溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)，就會出現異常(chang)。-40的(de)(de)(de)意(yi)(yi)思等(deng)同于耐(nai)溫(wen)(wen)(wen)(wen)(wen)(wen)等(deng)級(ji)，一(yi)個(ge)是(shi)(shi)耐(nai)高溫(wen)(wen)(wen)(wen)(wen)(wen)，一(yi)個(ge)是(shi)(shi)耐(nai)低(di)溫(wen)(wen)(wen)(wen)(wen)(wen)。如(ru)線(xian)(xian)材(cai)上印有-40的(de)(de)(de)字樣，表示(shi)該(gai)產品可應用(yong)(yong)于零下40度(du)(du)(du)以(yi)(yi)內的(de)(de)(de)工作環(huan)境。線(xian)(xian)材(cai)性(xing)(xing)能不(bu)會發生(sheng)變(bian)化 3.?基(ji)本(ben)理解為額(e)定在是(shi)(shi)此項條件下線(xian)(xian)材(cai)性(xing)(xing)能為*佳(jia)狀態！ ? ? 4.那要看什么材(cai)料(liao)做護套，如(ru)果一(yi)般聚(ju)(ju)氯乙(yi)烯(xi)(xi)材(cai)料(liao)，那耐(nai)低(di)溫(wen)(wen)(wen)(wen)(wen)(wen)性(xing)(xing)差，硬質聚(ju)(ju)氯乙(yi)烯(xi)(xi)使(shi)(shi)用(yong)(yong)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)一(yi)般不(bu)得低(di)于-15℃，軟質聚(ju)(ju)氯乙(yi)烯(xi)(xi)也只有-30℃。超(chao)過使(shi)(shi)用(yong)(yong)極限(xian)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)，聚(ju)(ju)氯乙(yi)烯(xi)(xi)制品迅(xun)速變(bian)硬變(bian)脆，以(yi)(yi)致無法使(shi)(shi)用(yong)(yong)。如(ru)果是(shi)(shi)聚(ju)(ju)乙(yi)烯(xi)(xi)，那耐(nai)低(di)溫(wen)(wen)(wen)(wen)(wen)(wen)性(xing)(xing)能就更好