问题 问答题 简答题

使用动力制动时应注意什么?

答案

参考答案:

装有动力制动装置的机车运行中调速时,应首先使用动力制动,当动力制动不能控制列车速度时,及时配合使用空气制动.并应做到:

⑴内燃机车在提,回动力制动手柄时,要逐位进行,至"1"位时应稍作停留.

⑵制动电流不得超过额定值.

⑶当动力制动与空气制动配合使用时,应将机车制动缸压力及时缓解为0(设有自动控制装置的机车除外).

⑷需要缓解时,应先缓解空气制动,再解除动力制动.

⑸多机牵引使用动力制动时,前部机车使用后,再通知后部机车依次使用;需要解除动力制动时,根据前部机车的通知,后部机车先解除,前部机车后解除.

单项选择题

When Dave was eighteen, he bought a secondhand car for 200 so that he could travel to and from work more (1) than by bus. It worked quite well for a few years, but then it got so old, and it was costing him (2) much in repairs that he decided that he had better (3) it.

He asked among his friends to see if anyone was particularly (4) to buy a cheap car, but they all knew that it was falling to pieces, so (5) of them had any desire to buy it. Dave’s friend Sam saw that he was (6) when they met one evening, and said, "What’s (7) , Dave"

Dave told him, and Sam answered, "Well, what about advertising it in the paper You may (8) more for it that way than the cost of the advertisement!" Thinking that Sam’s (9) was sensible, he put an advertisement in an evening paper, which read "For sale: small car, (10) very little petrol, only two owners. Bargain at 50. " For two days after the advertisement first appeared, there was no (11) . But then on Saturday evening he had an enquiry. A man rang up and said he would like to (12) him about the car. "All right, " Dave said, feeling happy. He asked the man whether ten o’clock the next morning would be (13) or not. "Fine, " the man said, "and I’ll (14) my wife. We intend to go for a ride in it to (15) it. "

The next morning, at a quarter to ten, Dave parked the car in the square outside his front door, (16) to wait there for the people who had (17) his advertisement. Even Dave had to (18) that the car really looked like a wreck. Then, soon after he had got the car as clean (19) it could be, a police car stopped just behind him and a policeman got out. He looked at Dave’s car and then said, "Have you reported this (20) to us yet, sir\

1().

A.directly 

B.safely 

C.properly 

D.easily

多项选择题