举个例子，一个开口端是9/16的扳手，它与闭锁式的9/16.6的扳手非常相似，但是差6个点的扳手远远要比能拧得很紧的扳手要好用的多，一个能粘装订书的工具要比一个开口端的扳手要好用得多。
闭口扳手
closed end wrench
暂无补充释义。
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