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下列性质属于力学性质的有()

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钢筋机械连接接头的检验方法

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刀具材料应具备有高的硬度和强度及红硬性

A. 对
B. 错

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In this book,it has _unit.

A. eight
B. four
C. two
D. nine

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What the unit one main idea.

A. How to be a asuccessful language learner
B. He was a very successful teacher
C. The pub is open to any adult to enter
D. Everyone has different opinions

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