砂皮上磨料颗粒的粗细直接影响打磨的效果，磨料的粗细(即磨料粒

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问题单项选择题

砂皮上磨料颗粒的粗细直接影响打磨的效果，磨料的粗细(即磨料粒度)用“目”表示，“目”是指筛网的每平方( )上的孔数。

A．公寸

B．毫米

C．英寸

D．厘米

答案

参考答案：C

补全对话，情景问答

补全对话。

A: May I ask you some questions?

B: 1________.

A: How do you like English?

B: 2________.

A: That's why you speak English so well. 3________?

B: I have been learning English for three years..

A: That's wonderful. Do you often speak English after class?

B: 4________. I often try my best to speak English with my friends. I don't think English is

so hard to learn well if you are hard-working enough. Do you think so?

A: Maybe you're right. Thank you for your advice.

B: 5________.

多项选择题

下面制度属于岗位十项制度的有（）。

A.岗位专责制

B.巡回检查制

C.交接班制

D.岗位练兵制