在安装电视接受天线时如果已清楚干扰是从侧面而来，则可采用（）_爱下问搜题

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问题单项选择题

在安装电视接受天线时如果已清楚干扰是从侧面而来，则可采用（）方法来对付。

A.主瓣凹陷对准干扰源

B.大前后比天线

C.天线阵

D.起低副瓣天线

答案

参考答案：D

单项选择题

C

A famous teacher was speaking to the students at our school. He began his lesson by holding up a $100 bill. Then he said to the three hundred students, "Who would like this $100 bill" The students began to put up their hands at once.
Then he said, "I am going to give this $100 to one of you, but first, let me do this. " He then made the bill into a ball. Then he said, "Who wants it now" The hands went back into the air.
"Well," he said, "What if I do this" and he dropped it on the floor and stepped on it. He picked up the dirty, crumpled bill and said, "Who still wants it" Hands went back into the air.
"My friends," he said, "you have learned a valuable lesson today. No matter (无论) what I did to the money, you still wanted it because it did not go down in value (价值). It was still worth $100!"
Many times in our lives, we are dropped, crumpled, and stepped on by the chances we take and the things that happen to us. We feel as if we are worth nothing. But remember, no matter what has happened to yon, you will never lose your value: you are always valuable to those people who love you. Your value doesn’t come from what you do or whom you know, hut WHO YOU ARE.
You are special and valuable. Don’t ever forget it!

Why did the famous teacher use a $100 bill at his lesson ( )

A．Because he wanted to make the bill into a ball.

B．Because he used to drop a bill on the floor and stepped on it.

C．Because he was going to give the bill to one of his students.

D．Because he wanted to make the students know what value was.

判断题

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