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What are the disadvantages of powder metallurgy（)

A.metal powders may deteriorate quickly

B.fixed and setup costs are high

C.non-moldable features are impossible to produce

D.sharp corners can be hard to produce

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Surprisingly what he did () what he said.

Surprisingly what he did （) what he said.

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第4题

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第5题

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A.which

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第6题

What is the Jazz Age？

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第7题

—Susan is absent from today ’s class. —（) As far as I know, she has never missed a class.

A.How come

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