当液位计出现由于气阻导致的（）时，可现行排空气体，再用磁棒等

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问题单项选择题

当液位计出现由于气阻导致的（）时，可现行排空气体，再用磁棒等磁性物体进行现场校正，以恢复现场液位的监控。

A.乱磁现象

B.浮子卡死

C.传感器故障

D.气阻现象

答案

参考答案：A

阅读理解

阅读理解。

Air is all around us. At the time we are born, air is around us everywhere (到处). We live in air.

All living things need air. Living things cannot live without air. We can go without food or water for

a few days, but we can't live a few minutes without air. We take in air. When we are working, we need

more air. When we are sleeping, we need less air.

We live in air but we cannot see it. We can only feel it. We can feel it when it is moving. Moving air

is called wind. How can you make air move? Here is one way. Take an open book in your hands in front

of your face. Close it quickly. What can you feel? It is air.

1. Where is air?

A. It's on the table.

B. It's around us everywhere.

C. It's near us.

D. It's not here.

2. Moving air is called _______.

A. wind

B. rain

C. snow

D. cloud

3. When do we need more air?

A. Sleeping.

B. Sitting.

C. Working.

D. Standing.

填空题

学习评价也称学力评价，是对学生的学习水平及其学习________所进行的评价。