根据《SDH本地网光缆传输工程设计规范》，机房内走线架或走线槽_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

根据《SDH本地网光缆传输工程设计规范》，机房内走线架或走线槽可按区域安装，高度应根据设备高度设计，列架应与设备架顶宜相距（）。

A.30mm

B.40mm

C.50mm

D.60mm

答案

参考答案：C

改错题

短文改错。
     对标有题号的每一行作出判断：如无错误,在该行右边横线上划一个勾；
     此行多一个词：把多余的词用斜线划掉在该行右边横线上写出该词,并用斜线划掉。
     此行缺一个词：在缺字处加一个漏字符号，在该行右边横线上写出该加的词。
     此行错一个词：在错的词下划一横线,在该行右边横线上写出改正后的词。
     注意：原行没有错误的不要改。

     Last summer I go to America and studied at a language
school. I had many wonderful experience, but I also
had a sad one. One day, the school held party, where
I invited to talk about Tianjin. After that they asked me a lot of
things about China. But I couldn’t explain them with English
clearly. I felt sadly. I learnt a lesson from this experience. I
have already studied English for eight years, I can’t use it
very good. I must work hard to improve my spoken English
so that I will not be able to communicate freely with foreigners.
I hope I can be a bridge between China or other countries
in the future.

1. _____
2. _____
3. _____
4. _____
5. _____
6. _____
7. _____
8. _____
9. _____
10. _____

单项选择题

已知标准罗经航向100°，自差-1°，此时操舵罗经航向105°；通过与标准罗经航向比对，得操舵罗经自差为（）。

A．+4°

B．+5°

C．+6°

D．-6°