已知tanα=-1，且α∈[0，π），那么α的值等于（） A．π3 B．2π3 C．

搜题请搜索小程序“爱下问搜题”

问题选择题

已知tanα=-1，且α∈[0，π），那么α的值等于（　　）

A．

B．

2π

C．

3π

D．

5π

答案

∵已知tanα=-1，且α∈[0，π），故α的终边在射线 y=-x （x≤0）上，故 α=

3π

，

故选C

填空题

短文填写。

先阅读短文，然后用方框中所给单词或短语的正确形式填空。(选项中有一个是多余的)

I'd like to tell you a story about my best friend Jane. Last week in school we had a big fight, and

she didn't 1 me. It all started when she asked me if she could copy my homework. I asked her why

she wanted to do that, and she said that she had forgotten to do hers. I said I didn't think it was a good

idea. I said it would start a bad 2 and she should do her own work. She got really 3 at me and

said she didn't want to be my best friend anymore. I said that was OK and that l was sure she would

4 it. And she did. Yesterday she told me she was 5 . She said it was much better if she did her

own work.

单项选择题

下列关于Quidway交换机上VLAN配置，正确的是（）

A.缺省情况下，交换机的VLAN特性是关闭的，需要通过vlan enable命令打开；

B.Quiway交换机的缺省VLAN是VLAN1，该VLAN无需建立，但可以被删除；

C.创建VLAN虚接口前，必须先创建其对应的VLAN；

D.一个VLAN虚接口只能配置一个IP地址。