问题 单项选择题

关于无线微波扩频技术,以下哪种说法是错误的

A.相连两点距离可以很远,适用于相连两点之间具有大量阻挡物的环境

B.抗噪声和抗干扰能力强,适应于电子对抗

C.保密性强,有利于防止窃听

D.建设简便、组网灵活、易于管理

答案

参考答案:A

解析:利用无线懂波扩频技术,相连单位距离不能太远,并且两点直线范围内不能有阻挡物。

单项选择题
改错题

短文改错(共10小题,每小题1分,满分10 分)

此题要求改正所给短文中的错误。对标有题号的每行作出判断:如无错误,在该行右边

横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

该行多一个词;把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

该行缺一个词:在缺词处加一个漏字符号( ∧),在该行右边横线上写出该加的词。

该行错一个词:在错的词下画一横线,在该行右边横线上写出改正后的词。

注意;原行没有错的不要改。

Did you enjoy yourself yesterday? I suppose you do.                      76.          

But I had a very terrible day yesterday. Everything                77.          

went wrong. In the morning, your alarm clock didn't ring, so I      78.          

woke up late. I was in such hurry that I burnt my hand when         79.          

I was preparing breakfast. Then I ran out the house to catch        80.          

the 8:30 bus. That was the bus I normal took. I missed it. I was    81.          

worried so my teacher hated the students coming late to             82.          

school. As a result, I ran three mile to school. When reaching     83.          

to the classroom, I found all the classmates were in the           84.          

classroom and I felt ashamed. How a bad day it was!                  85.