问题 多项选择题

ZXDU组合电源系列在机架安装时要做到()。

A、机架安装要水平、垂直,垂直偏差应不大于3mm

B、机架的正面走道净宽不应小于1.5m,侧面背面与墙之间走道净宽必须大于0.8m

C、机架上各种零件不得脱落或碰坏,机架油漆完好,各种标志应正确、清晰、齐全

D、机架不能有摇晃现象,门板、侧门板应上紧

答案

参考答案:A, B, C, D

单项选择题 A1/A2型题
完形填空

第二节(共5小题;每小题2.5分,满分12.5分)

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

People know the dangers of fires. It’s good for a family to learn how to prepare for a fire. Here are some suggestions.

Put a smoke alarm in the house. The alarm makes a loud sound.   71    

Make escape plans. They should know all the ways out of the house. If there is a fire, everyone follows the plan to get out.   72  

Practise for a fire. They do fire practice because they teach children about fire safety.Everyone in the family should know the following fire rules:

Don't open a hot door! The fire can grow more quickly if you open the door. 73   Smoke can be more dangerous than fire. The best air is near the floor because smoke rises.

What will you do if your hair or clothes start to burn? First, don’t run! The fire burns faster because of more air. Drop! Fall to the floor. Then roll!    74    Put a blanket around you to keep air away from the fire that may still be on you.

There are many possible causes for fires.    75    If there is a fire, don’t forget to call 119 for help.

A.Turning over and over will make the fire go out.

B.Smoke from a fire causes the alarm to go off.

C.The cleanest air is found at the top.

D.Stay close to the floor!E. A wise family is ready all the time.

F. Make sure all the windows can be opened easily.

G. Do not go back to the house for any reason.