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问题 问答题 简答题

在什么情况下需要交换名片或不交换？

答案

参考答案：

⑴、希望认识对方；被介绍给对方；对方提议交换名片；对方向自己索要名片；通知对方自己的变更情况等。

⑵、对方是陌生人；不想认识对方；不愿与对方深交；对方对结识自己并无兴趣；经常与对方见面；双方之间地位身份年龄相差悬殊。

单项选择题

All her life, my mother wanted busy children. It was very important that her house should remain at all times clean and tidy.
You could turn your back for a moment in my mother’s house, leave a half written letter on the dining table, a magazine open on the chair, and turn around to find that my mother had "put it back where it belonged," as she explained. My wife, on one of her first visits to my mother’s house, placed a packet of biscuits on an end table and went to the kitchen to fetch a drink. When she returned, she found the packet had been removed. Confused, she set down her drink and went back to the kitchen for more biscuits, only to return to find that her drink had disappeared. Up to then she had guessed that everyone in my family held onto their drinks so as not to make water rings on the end tables. Now she knows better.
These disappearances had a confusing effect on our family. We were all inclined to forgetfulness, and it was common for one of us, upon returning from the bathroom, to find the every sign of his work in progress had disappeared suddenly. "Do you remember what I was doing" was a question frequently asked, but rarely answered.
Now my sister has developed a secondhand love of clean windows, and my brother does the cleaning in his house, perhaps to avoid having to be the one to lift his feet. I try not to think about it too much, but I have at this later time started to dust the furniture once a week.

This passage mainly tells us that

A．my mother often made us confused
B．my family members had a poor memory
C．my mother helped us to form a good habit
D．my wife was surprised when she visited my mother
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单项选择题

交流电的有效值和最大值之间的关系为（）。

A.Im=√2I；

B.Im=√2I/2；

C.Im=I。
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