有线电视系统的干线采用架空明线安装要注意以下几个方面（）。A

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有线电视系统的干线采用架空明线安装要注意以下几个方面（）。

A、架空明线的电杆距离不能太长

B、干线电缆如利用照明线电杆架设时，应距电源线1.5m以上

C、沿墙架设的干线应用专用电缆卡固定

D、墙与墙之间如距离较远，应用钢丝架挂电缆

E、干线电缆如利用照明线电杆架设时，应距电源线1.5m以下

答案

参考答案：A, B, C, D

阅读理解

阅读理解，根据所给首字母，按原文填空。

I love to go on trips. Trips are fun. I want to go to Beijing. It is far from my home. Beijing is a big city. It's

the capital city of our country, China. It has big shops, restaurants and hotels. Tian'anmen Square is in Beijing.

It's very famous. The Palace Museum is in Beijing, too. It is very old and beautiful. Beijing is great. China is

great.

1. T____________ are very interesting.

2. My home is f____________ from Beijing.

3. The c____________ city of China is Beijing.

4. Beijing has big s____________, r____________ and h____________.

5. T____________ S____________ is in Beijing.

6. The P____________ M____________ is o____________ and b____________.

7. C____________ is great, B____________ is great, t____________.

填空题

写出下列有机物的系统名称。

(1)___________________

(2) ______________________