问题 问答题 简答题

PQY平移机构控制屏线路有哪些特点?

答案

参考答案:

PQY平移机构控制屏线路的特点有:(1)PQY平移机构控制屏为对称线路。(2)主令控制器的档数为3-0-3,6个回路。(3)电动机转子回路串接4(或5)级起动电阻,第一、二级电阻为手动切除,其余由时间继电器控制自动切除。(4)制动器操纵元件与电动机同时通电或断电。(5)允许直接打反向第一档,实现反接制动停车。

阅读理解

阅读理解。

    After supper, Mr Hunt came out. The sun was setting down in the west and it was a little cool outside.

Few people would stay at home There were a lot of people near the river. He was walking along the bank

while some friends greeted him. An hour later, he felt tired and sat down on a chair near the end of the

bridge.

    Suddenly, the old man heard a violent (激烈的) quarrel at the other end. He stood up and saw several

people were there. As a policeman, he thought it was his duty to find out what was happening to them.

He went there and noticed four women quarrelling with each other. He tried to prevent them from doing

it, but nobody listened to him. He thought for a while and had an idea.

    "Let's hear the oldest speak first!"

    Hearing this, all of them stopped and left in a hurry, with red faces.

1.Few people would stay at home because ______. [ ]

A.it was hot in the houses

B.they enjoyed doing some exercises

C.they hoped to talk with their friends

D.the scenery outside was nice

2.Mr.Hunt came out to ______. [ ]

A.greet to his friends

B.hear the women quarrel

C.walk along the bank

D.find a chair to sit on

3.Mr.Hunt thought ______, so he went to the other end of the bridge. [ ]

A.the women would listen to him

B.he should prevent them from quarrelling

C.the women would say something interesting

D.he should take the women to the police station

4.Each woman was afraid to ______, so they hurried off. [ ]

A.be beaten by the policeman

B.be thought as the oldest

C.go home too late

D.see the old policeman

填空题