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问题 单项选择题

8086有两种工作模式，即最小工作模式和最大工作模式，其中最大工作模式由 ( )。

A．MN/

=H电平

B．MN/

=L电平

C．HOLD=H电平

D．HOLD=L电平

答案

参考答案：B

解析： 两种模式取决于MN/

信号。

完形填空

A donation thank-you letter not only shows your good manners,   小题1:  can help deepen your ties. Also, the other person will feel that   小题2:  appreciate his or her contribution, however small it is.

When you are writing   小题3:  donation thank-you letter, you should use the name of the donor instead of just using a basic greeting. You should thank the person sincerely for his or her support and explain   小题4:  useful it proved to you. You need to tell the person the good things   小题5:  their donation helped you achieve. You need to be specific as to when, how and on whom or for what the donation was used. The tone of the letter should be personal, as if you  小题6: speaking face to face to  the donor.

You should send the letter in 48 hours  小题7:  receiving the donation. If you fail to do that, then it should be sent over within a week. The sooner you send it, the  小题8: .
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单项选择题

WCDMA系统中，如果接收天线之间要达到较好的分集效果，则工程安装中天线水平间距在（）以上。

A、1米

B、2米

C、4米

D、5米
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