问题 问答题 简答题

液压支架有哪些元件组成?

答案

参考答案:

液压支架由承载结构件、执行元件、控制和操纵元件、辅助装置、传动介质等组成。承载结构件有顶梁、掩护梁和底座等;执行元件有立柱和各种千斤顶;控制和操作元件有操作阀、隔离阀及各种油缸和控制阀等;辅助装置包括推移装置,挡矸、防滑、喷雾、照明等装置。

阅读理解

One day, a farmer was walking along a road with his son Thomas. The father said, "Look! There’s a horseshoe. Pick it up and put it in your bag." Thomas said, ’It isn’t worth the trouble." His father said nothing but picked it up himself. When they got to a nearby town, they lad a rest. There the farmer sold the horseshoe and with the few pennies he bought some cherries.

The father and the son continued their way. The sun was well up in the sky, and there wasn’t a house or even a tree where they could have a rest. Thomas felt too thirsty to walk on. At this time, his father dropped a cherry on the ground and Thomas picked it up quickly and ate it. After a while, his father dropped another cherry and once again, his son lost some time in picking it up and putting it in his mouth.

And so they went on. The old farmer dropped the cherries and the son picked them up. When Thomas had eaten up all the cherries, his father said to him, "My dear son, if you had bent down earlier to pick up that horseshoe. it would not have been necessary for you to bend so many times for the cherries. Always remember the lesson that anyone who does not worry about the little things will find that he cannot do the great things.

小题1:Who picked up the horseshoe at last?

A.Thomas.

B.The old father.

C.Both the father and the son.

D.Neither the father nor the son.小题2:The farmer bought _______ with the money after lie sold the horseshoe.

A.some food

B.some water

C.some cherries

D.some pennies小题3:When the son refused to pick up the horseshoe, the father _______.

A.felt very happy

B.didn’t say anything

C.beat the son

D.became a little angry小题4:The father dropped the cherries one by one, because _______.

A.he wanted his son to eat them all

B.he wanted his son to do more exercise

C.lie wanted to teach his son a lesson

D.he wanted his son to pick them up小题5: From the story, we can learn that _______.

A.cherries are so delicious that most of is like to eat-them

B.a horseshoe is so expensive that it can bring us a lot of money

C.if the boy wants to eat cherries, he must pick up the horseshoe

D.if we want to do some great things, we should start with some small ones

单项选择题