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常见的钎焊方法有()等。
孩子提出问题,有些不好讲或讲了他也不理解,家长应()。
就红细胞生成素(EP)而言,下述错误的是()
属于报纸批评失实的报纸是()
渗透探伤前,对试件进行预清洗的最好办法是蒸汽除油。
关于净现值的说法不正确的是( )。
有一工作,甲做2天后乙接着做,做了10天后完成了工作。已知乙单独完成需要30天,那么甲单独完成此工作需要( )天。
简述地理环境及其对社会发展中的作用。
科学假说的特点决定了它在科学研究中具有重要的方法论作用。
类风湿关节炎僵硬感最明显的时间是()
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