压力表距操作平面2－4mm时表盘公称直径应不小于（）A、100mm B_爱下问搜题

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问题单项选择题

压力表距操作平面2－4mm时表盘公称直径应不小于（）

A、100mm

B、150mm

C、200mm

答案

参考答案：B

填空题

选择动词词组，并用其适当形式填空。

go to sleep, learning…by themselves, used up, come ture, be angry with

1. Sometimes, I would              my best friend, but not for long.
2. Tom, it's time for you to              or you will get up late tomorrow.
3. The young man               all the paper.
4. I think my dream will               sooner or later.
5. The students in poor areas are               some subjects              .

单项选择题

牙面清洁后到新的牙菌斑成熟，可被菌斑显示剂着色的时间大约是（）

A.2小时

B.12小时

C.9小时

D.2天

E.12天