问题 问答题 简答题

高压静电除尘器有哪些运行操作注意事项?

答案

参考答案:

(1)高压静电除尘器应在启动皮带前投入运行。

(2)合上总电源开关,进行运行操作。

(3)按下高压电源按钮,并将输出高速电源限制旋钮顺时针方向逐步高速到所需要的电压、电流。

(4)启动风机,保证除尘效果。

(5)运行中应经常巡视、检查运行情况。

(6)注意电压、电流的变化,跟踪电流是否正常。

(7)运行时,严禁任何人接近高压电场及高压危险区。

(8)待皮带停止运行后,再停止高压静电除尘器。

(9)停止工作时,先关闭风机按钮。

(10)按动手动振打按钮,对收尘板进行振打清灰,其振打时间定值要根据粉尘浓度而定。

阅读理解

阅读理解。

     HAVE you ever thought of being able to fly around the world in a few hours though it is about 40,000

kilometers? Now, maybe you can. Last Saturday, the American X-43A airplane made its first flight. It

reached a speed of 8,000 kilometers an hour. This makes it the fastest plane in the world. X-43A is only

three to four meters long,but it's very heavy: it weights 1,270 kilos.

     HOW old cart an insect be? 400 million years! Last Wednesday, scientists found the world's oldest insect

fossil (化石) in Britain. The fossil shows that the body of the insect was as big as a piece of rice and had

wings (翅膀). In the past, people thought the earliest insect was 380 million years old.

    THERE will be a new "star" in the sky soon. China plans to send a satellite (卫星) into space by September

2009. It will stay in space for one year. It will go around the moon and take pictures. It must be very

expensive, right? That's for sure-1.4 billion yuan! 

    Yuan Longping, the father of hybrid rice (杂交水稻), won the World Food Prize on Monday. Yuan

developed the world's first popular and widely grown hybrid rice. Hybrid rice plants can make more rice

than the ones people grew before.

1.If the X-43A goes round the earth, it will take about ______ hours to finish the trip. [ ]

A.3

B.5

C.8

D.12

2.The newly-found insect fossil showed that the earliest insect was ______ years older than believed. [ ]

A.10 million

B.400 million

C.20 million

D.380 million

3.Which of the following about the new star is NOT true? [ ]

A.It will go into space by September 2008.

B.It will stay in space for twelve months.

C.It costs a lot.

D.It will go around the moon.

4.Yuan Longping won the World's Food Prize because he ______. [ ]

A.is the father of his children.

B.likes to eat hybrid rice.

C.developed the world's first popular and widely grown hybrid rice.

D.grows more rice than others.

5.The above paragraphs are taken from ______. [ ]

A.a story

B.an advertisement

C.an explaining writing

D.a newspaper

单项选择题