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And yet most of us have seen a report card or heard a trumpet solo that (3)

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如果单件或者小批量生产大型齿轮可以采用焊接结构。

Some people become (4) in winter, when the days are dark and most people spend less time in the open air.

今文经学是清中叶兴起的一个经学流派,因袭汉代的说法而立。

预紧力过大会影响带的工作能力,容易打滑,预紧力过小会使带产生磨损,加快松弛,降低寿命。

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