对工件进行分级淬火的目的是（）A．得到下贝氏体 B．减少残余奥_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

对工件进行分级淬火的目的是（）

A．得到下贝氏体

B．减少残余奥氏体量

C．减少工件变形

D．缩短生产周期

答案

参考答案：C

补全对话，情景问答

从方框中选择最佳选项完成对话，有两项多余。

A. But that wasn't true.
B. No, I didn't.
C. But I find math really difficult.
D. Yes, I did.
E. What did your English teacher say?
F. I'm glad to hear that.
G. I said I would.

Father: Did you get your report card, Tom?
Tom: 1_______
Father: Let me have a look.
Tom: Here you are.
Father: You got an A in English. 2_______
Tom: He said that I was good at speaking and listening.
Father: 3_______ Er... your math grade is not good. What did your math teacher say?
Tom: He said that I was kind of lazy. 4_______
Father: Why do you say so?
Tom: I was really hard-working. 5_______
Father: Oh! I think you need a tutor.

判断题案例分析题

某工地工人在拆现浇楼板钢模时，审批手续还未办好，由于面积大，一时拆不完，中午吃饭时，工人吴某从未拆完的钢模板下经过，突然上边已活动的几块钢模板掉了下来，刚好击中吴某头部，经抢救无效死亡。请判断事故原因。

未戴安全帽进入施工现场。