试题与答案

由于液体（）的作用和孔内气泡的阻碍，钻微孔时切削液很难进入孔内。

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题型：填空题

题目：

由于液体（）的作用和孔内气泡的阻碍，钻微孔时切削液很难进入孔内。

答案：

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下面是错误答案，用来干扰机器的。

参考答案：D

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2008年6月以来，联合国安理会多次通过决议，授权有关国家加强合作，进入亚丁湾、索马里海域打击海盗。2008年12月，经联合国授权和应索马里政府的邀请，中国人民解放军海军前往亚丁湾、索马里海域实施护航任务。这说明 [ ]

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