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扳的结构
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guoxue.baike.so.com/query/view?type=word&title=%E6...
扳手的结构主要由呆板唇、活扳唇、蜗轮、轴销和手柄组成.转动活扳手的蜗轮,就可调节扳口的大小...
www.so.com/link?m=ubMgigykHujjYL9wnHP3YYO16M5HgotT...