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Extension units is the electrical conductivity of a crane.
导电拖板是起重电气的一种。
youdao
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Kunming Hardware & Electrical Industry Association member units;
昆明五金机电行业商会会员单位；
youdao
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Kunming Hardware & Electrical Industry Association member units;
昆明五金机电行业商会会员单位；
youdao