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问题 单项选择题

在防火墙上配置的基本策略是“除非明确禁止，否则允许”，这种策略是（）

A.宽松控制策略

B.限制控制策略

C.折衷控制策略

D.Eudemon 默认控制策略

答案

参考答案：A

填空题

单词拼写。

1. I can't find my cat. Do you see it a ______?

2. Birds k ______ on the cage door with their beaks (喙) when they are hungry.

3. That glass is on the edge of the table. Put it in the m ______.

4. Please f ______ your dog. It is very hungry.

5. There is no milk in the bottle. It's e ______.

6. The ______ (拥有者) of these goldfish is a little girl.

7. It's ______ (必要的) for us to learn English well.

8. Look! The dog is ______ (追赶) a cat.

9. I like to keep a goldfish as a pet because it isn't any ______ (麻烦).

10. An elephant usually walks very ______ (慢).

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单项选择题

苯的国家卫生标准是

A．20mg/m3
B．30mg/m3
C．40mg/m3
D．50mg/m3
E．60mg/m3
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