题目内容

带压不置换焊割需要置换原有的气体。

A. 对
B. 错

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Listen to the passage and fill in the blanks with the words you hear. Ladies and gentlemen, welcome to our company. First let me introduce myself. I'm Li Hong, the 1)_____ of our company. I’d like to show you around our department store and introduce our 2)_ . As you know, Chinese silk is very famous throughout the world. The quality is high and the price is 3)_ . There are about 1000 workers in our company and we have the best equipment in the world, and the silk made in our factory is very 4)_.We make all kinds of clothes with pure silk. Please come over to have a look at them, and then feel the pure silk with your hands. Thank you for your 5) _______. Now, if you have any questions, please ask me.

下列( )为形状公差项目的符号

A. ⊥
B. ∥
C. ◎
D. Ο

在几何公差符号中,符号“◎”表示( )

A. 圆度
B. 圆柱度
C. 同轴度
D. 对称度

在图样上标注几何公差,当公差值前面ø时,该被测要素的公差带形状应为( )

A. 两同心园
B. 两同轴圆柱
C. 圆形或球形
D. 圆形或圆柱形