标准内容 对照这个,就可以看出“bv”和“bvr”是什么意思了。 bv: b——按用途分,固定敷设用电缆(电线); 铜导体省略; v——按材料特征分,绝缘聚氯乙烯。 bvr: b——按用途. Lesen sie § 27 ii.
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