问题
单项选择题
采用耦合宏蜂窝基站信号方式时，最大限度地减少对室外发射功率的影响，采用的有源放大设备应设置适当的（），最大限度地减少对宏蜂窝基站的噪声引入。
A.上行增益
B.上下行增益
C.下行增益
D.输出功率
答案
参考答案：B
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采用耦合宏蜂窝基站信号方式时，最大限度地减少对室外发射功率的影响，采用的有源放大设备应设置适当的（），最大限度地减少对宏蜂窝基站的噪声引入。
A.上行增益
B.上下行增益
C.下行增益
D.输出功率
参考答案：B
| 完形填空. | ||||
| Mr. Clarke works in a middle school. He likes reading and often __1__ some books from the library. He keeps __2__ to the radio every morning and reading __3__ after supper. So he knows much and teaches well. His __4__ worship (崇拜) him very much. Mike, Mr. Clarke's little son, is only nine. He __5__ likes reading books. And he often asks his father some questions. Mr. Clarke always thinks he's too __6__ to understand him and chooses __7__ ones to answer. Of course the boy is not satisfied with it. One day Mike read __8__ about the electric lights and was __9__ it. When his father told him to do some housework, he went on thinking of it. He asked him __10__ questions, and his father answered all. Then his father said proudly, "Fathers always know __11__ than sons!" The boy thought for a while and said, "__12__" "Oh? Why?" Mike didn't answer and asked __13__ , "Who invented the electric lights?" "Thomas Edison," answered Mr. Clarke. "Why __14__ his father invent them then?" Looking at his son, Mr. Clarke didn't know __15__ to answer! | ||||
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