超细晶粒合金刀具的使用场合不应包括（） A.高硬度、高强度的加

搜题请搜索小程序“爱下问搜题”

问题单项选择题

超细晶粒合金刀具的使用场合不应包括（）

A.高硬度、高强度的加工材料

B.难加工材料的间断切割

C.高速切削普通钢材

D.要求有较大前角，能进行薄层切削的精密刀具

答案

参考答案：C

单项选择题 A1型题

下列心电图改变哪项是正确的（）

A.继发孔型房间隔缺损常见不完全性右束支传导阻滞

B.原发孔型房间隔缺损心电图大多正常

C.室间隔缺损早期常见右室增大

D.动脉导管未闭早期多见电轴右偏

E.法洛四联症常见左、右室心肌劳损

补全对话，情景问答

根据上下文，补全对话中所缺的单词，每空一词。

A: Can I help you?

B: Yes, please. Today is Mother's Day. I want to buy a present for my 1. . But I don't know what

to buy.

A: Maybe you can buy her some 2. .

B: Great! But what flowers should I buy?

A: I think carnations are better. They show happiness and love. They are for mothers.

B: How 3. are they?

A: Twenty yuan a bunch (束).

B: OK. I'll buy carnations. Here is the 4. .

A: Thank you and best 5. to your mother.