题目内容

A compressor should never be stopped ().

A. without first cooling it
B. without first heating it
C. without first unloading it
D. without first loading it

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一个产品的生命周期包含的环节是()

A. 原材料加工
B. 产品制造
C. 产品使用
D. 循环利用

谷类含糖70-80%,主要营养成分是()。

If you had taken the medicine yesterday, you()much better now.

A. must have felt
B. might have felt
C. would have felt
D. would feel

焊点布置要有一定的合理性,排数不多于()。

A. 5
B. 2
C. 3
D. 4

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