换浆
参考答案:
用稀泥浆更换稠浆的工序。
Under the law of obligations, explain the importance of a valid offer and acceptance for a contract to be deemed valid. (10 marks)
两根钢制拉杆受力如下图所示,若杆长L2=2L1,横截面面积A2=2A1,则两杆的伸长△L和纵向线应变ε之间的关系应为()。
A.
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D.