和标准准型群钻相比，不锈钢群钻钻尖销高、弧槽稍浅，钻头（）磨

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问题单项选择题

和标准准型群钻相比，不锈钢群钻钻尖销高、弧槽稍浅，钻头（）磨出断屑槽。

A.前面

B.后面

C.主切削刃

D.横刃

答案

参考答案：A

填空题

用括号内所给词的正确形式填空。

1. Have you ever seen this kind of _________ (music) instrument?

2. England is a _________ (Europe) country.

3. The basketball match was very _________ (wonder).

4. I have _________ (discover) English is very useful.

5. The twins have been to the _________ (unite) States.

单项选择题

RIP路由协议根据（）计算metric参数？

A.跳数

B.可靠性

C.负载

D.带宽

E.延迟

F.MTU