题目内容

检验煅烧程度的主要手段是什么?

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食盐中水分测定双试验误差为()。

A. 0.3%
B. 0.05%
C. 0.2%
D. 0.10%

机泵的()损坏,会导致机泵振动。

A. 阀门手轮
B. 对轮罩
C. 密封
D. 轴承

We()our breakfast when the pilot came on board.

A. just have had
B. just had
C. have just had
D. had just had

卯西法截弧是()方向,其方位角为()。

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