问题 问答题

简述隔膜计量泵P1207/P1213启动步骤。

答案

参考答案:

1、通过旋转冲程调整螺帽或手柄,将冲程指示调整至零位。

2、打开入口、出口阀。

3、点动电机,检查泵的运转情况,同时注意马达的旋转方向是否正确(从风扇侧看顺时针方向为正转),若不正确要调整马达的电源接线。

5、启动电机。

6、在不施加压力的前提下,每隔15分钟提高冲程20%,若没有压力,不要大幅度提高冲程。

注意:检查(1)泵的声音或振动是否异常(2)冲程调节是否自动

7、加压

(1)对于排液压力低于2.0MPa,则泵的冲程长度应逐步增加,每次增加20%,保持15分钟。

(2)对于排液压力大于2.0MPa,则需特殊加压,保证泵的排液压力逐步增加,每次为最终排压的20%。

(3)在压力不能增加时,按每次增加20%冲程来逐渐提高泵的冲程。

阅读理解

Two thousand years ago,beside the beautiful and rich Loulan Lake,there lay Loulan ancient city of the Silk Road.Businessmen from every country gathered here and there were lots of dancing parties小题1:

However,two thousand years later,this rich land suddenly disappeared from the map of China 小题2: 

Loulan was first “discovered” by a Swedish man,Sven Hedin,in 1900.People from other countries all began to come here小题3: He visited and studied this area and found many relics (遗迹)that were beautifully and carefully made.

It is recorded that the ancient city of Loulan was the capital of Loulan Kingdom during the Han and Jin Dynasties (朝代),and covered an area of about 100,000m2. 小题4:  Outside the city,there are some dried rivers and much farmland.In the past century,many coins,mirrors and other things from Greek and Roman have been dug out there.小题5:

The Loulan Kingdom is now a lifeless area with endless “forests” of mounds (小丘)which aren’t easily seen in other parts of the world.So people from many countries have been interested in this place.

根据材料内容,从下面五个选项中选出能填入文中空缺处的最佳选项,使短文意思通 顺、内容完整。

A.All these things show that business between East and West once took place there.

B.People in Loulan lived a rich life then.

C.Inside the city there are government offices and other old buildings.

D.Then it became an area covered with sand and dead trees.E.Then a Chinese named Huang Wenbi came to Loulan.

多项选择题