在使用外径千分尺调整零位时，必须使微分筒上的棱边与固定套管上

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问题单项选择题

在使用外径千分尺调整零位时，必须使微分筒上的棱边与固定套管上的“0”线垂合，同时要使微分筒上零线对准固定套管上的（）。

A.横刻线

B.零线

C.纵刻线

D.没有关系

答案

参考答案：C

阅读理解

阅读短文，判断下列句子正(T)误(F)。

I am a little fish. I live in the sea. It is dark (黑暗的) there, but I am not afraid. There are so many fish

living near me that I always have lots of friends.

I feel happy very much, because I love to swim. My mother often warns (警告) me to be careful (小心的)

because some big fish may eat me up. I know that she is right. Mother loves me and I love her, too.

短语注释： ①so…that… 如此……以致 ②warn …to do 警告……做…… ③eat up 吃(光)

( ) 1. My home is in the sea.

( ) 2. I like swimming.

( ) 3. I have many classmates.

( ) 4. If I am not careful enough, some big fish may kill me.

( ) 5. Mother and I love each other.

单项选择题

金属管道进行耐压试验时，严禁使试验温度接近金属的（）温度。

A.平均试验

B.设计试验

C.塑性转变

D.脆性转变