基站主馈线弯曲半径要求大于()。

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问题:

基站主馈线弯曲半径要求大于()。

考点:通信工程师电信网络管理基础知识电信网络管理基础知识题库
题型:填空题

阅读理解。

     My elder sister is an airhostess (飞机服务员). Yesterday morning my sister was at the back of the plane.

She was going to take food and drinks to the passengers. A little old woman, who took on the plane for the

first time, came up to her and said, "Could you tell me where the Ladies' Room is?"

     "Certainly, Madam," answered my sister. "It is right at the other end of the plane in the front." The old

woman went too far. She walked all the way to the front of the plane, opened the door in front of her and

saw the captain (机长) and his workmates in the small room. They were all busy with their work and didn't

see her. She went out again and came back to my sister. "Oh, did you find it?" asked my sister. "Yes, I did,"

said the little old woman."But there were four men in the Ladies' Room watching TV!"

1. What does the writer's elder sister do?

A. She is a worker.

B. She is a teacher.

C. She is an airhostess.

D. She is a student.

2. Who does she take food and drinks to?

A. Her brother.

B. The passengers.

C. The captain.

D. The madam.

3. Why didn't the old woman know where the Ladies' Room was?

A. Because she travelled by air for the first time.

B. Because she wanted to walk with my sister.

C. Because she was very old.

D. Because there weren't any toilets in the plane.

4. Where did the old woman go? 

A. Bedroom.

B. Men's room.

C. Control cabin (控制舱).

D. Sitting room.

5. What did the old woman think?

A. My sister fooled her.

B. My sister fooled the four men.

C. The old woman thought she went to the wrong place.

D. The four men watched TV in the Ladies' Room.

题型:填空题

在显微镜下观察到的物像暗淡、偏左上方,如何操作才能使它明亮并位于视野中央(  )

A.换用小光圈,装片向右下方移动

B.换用大光圈,装片向左上方移动

C.换用小光圈,装片向左上方移动

D.换用大光圈,装片向右下方移动

题型:填空题

越鞠丸主治六郁证,下述哪一项不正确( )

A.香附治气郁

B.川芎治血郁

C.半夏治痰郁

D.栀子治火郁

E.苍术治湿郁

题型:填空题

“神舟”七号载人航天发射控制中心的大屏幕上出现的一幅飞船运行轨迹图如下,它记录了飞船在地球表面垂直投影的位置变化;图中表示一段时间内飞船绕地球沿圆周飞行四圈,依次飞经中国和太平洋地区的四次轨迹①、②、③、④,图中分别标出了各地点的经纬度。通过观察此图,某同学发现,飞船绕地球环绕一周的过程中,地球大约自转22.5°。已知地球半径为6.4×103km,依据上述信息可估算该飞船距离地面的高度大约为

[ ]

A.4×105km

B.6.4×103km

C.300km

D.比地球同步卫星距离地面的高度要高

题型:填空题

在面向对象模型中,根据可继续的父类的个数通常把继承分为两种:单继承和多继承,单继承的层次结构图是______。

A) 树
B) 无向图
C) 有向图
D) 二叉树

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