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005.第055集 王莽时代出现了铜制“游标卡尺”，它到底有多精确？
005.第055集 王莽时代出现了铜制“游标卡尺”，它到底有多精确？
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By lishusheng005.第055集 王莽时代出现了铜制“游标卡尺”，它到底有多精确？