一根或二根单芯电缆不允许敷设在铁质管道中。
Remark One or two singal-core cable not allowed laying in iron pipe.
要知道，有俩种二分量视频电缆：4芯和7芯。
Remember, there are two types of S-Video cables: 4-pin and 7-pin.
热缩指套用于电缆分叉处的绝缘盒密封保护，有二芯、三芯、四芯、五芯规格产品。
Yonggu heat shrinkable for protection of insulation and sealing in fork position. it includes two cores. threecores. four cores, five cores.
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