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问题 多项选择题

下列说法中属于ISO/OSI七层协议中应用层功能的是（）。

A、拥塞控制

B、电子邮件

C、防止高速的发送方的数据把低速的接收方淹没

D、目录查询

答案

参考答案：B, D

选择题

Let’s visit the National Museum this weekend, _______?

A．will you

B．won’t we

C．don’t we

D．shall we
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选择题

I saw a woman running toward me in the dark.Before I could recognize who she was，she had run back in the direction______ she had come.

A．of which

B．by which

C．in which

D．from which
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