缩分机必须经过检验方可使用。检验缩分机的煤样包括留样和弃样的_爱下问搜题

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问题单项选择题

缩分机必须经过检验方可使用。检验缩分机的煤样包括留样和弃样的进一步缩分，必须使用（）。

A、二分器

B、电动振筛机

C、大筛分用筛

D、小筛分用筛

答案

参考答案：A

选择题

The train was crowded and I had to get into a carriage ______ already seven other people. [ ]

A. when there were

B. which there were

C. that there were

D. where there were

单项选择题 A1/A2型题

接种后的API试条一般经多少度孵育18~24h可以观察结果（）

A.30～40℃

B.35～37℃

C.36～38℃

D.37～39℃

E.32～35℃