搜题请搜索小程序“爱下问搜题”
问题 问答题 简答题

输送机突然停车有哪些原因？怎样处理？

答案

参考答案：

原因：

（1）输送机运载物料超负荷。

（2）输送机的张力太大。

（3）电气线路故障。

处理：由于输送机突然停车，要把输送机上的物料运输出去并在不联锁的情况下，单独运行并查找原因进行处理。

单项选择题

习惯上所称的交流电，其变化规律是随时间按（）函数规律变化。

A、正弦

B、余弦

C、正切

D、余切
查看答案
问答题

Part C Directions: Read the following passage carefully and then translate the underlined segments into Chinese. Your translation should be written neatly on ANSWER SHEET 2. Man first appeared on earth about 2 million years ago. Then he was little more than an animal, but early man had a big advantage over the animals. He had in his brain special groups of nerve cells, not present in animals, that enabled him to invent a language and use it to communicate with his fellow men. 46) This ability to speak was of great value because it allowed men to share ideas, and to plan together, so that tasks impossible for a single person could be successfully undertaken by intelligent team-work. Speech also enabled ideas to be passed on from generation to generation so that the stock of human knowledge slowly increased. It was this special ability that put men far ahead of other living creatures in the struggle for existence. 47) He mastered darkness first with dim lights and later with brighter and brighter lamps, until he can now make for himself so dazzling a light with an arc lamp that, like the sun, it is too p for his naked eyes. 48) Man found that his own muscles were too weak for the work which he wanted to do; be explored many other forms of power until now he has his hands on the ultimate source of physical energy, the nuclear power. From man’s earliest days the flight of birds has raised his wonder and desire. Why should he not fly as they did Then he began to experiment. At last he learnt how to make the right machines to carry him through the air. Now he can fly faster than sound. Already he has plans for conquering space, and a series of experiments has been completed.. 49) It will not be long now before man takes a giant step away from his planet and visits the moon, learning what it is like to have no weight to his body, no upward direction and no downward. Man, always a wanderer, has to overcome the difficulty of adapting himself to different climates. 50) Fortunately, in spite of having no thick skin or warm fur to protect him, he is peculiarly p compared with other living creatures, most of whom are unable to live far outside the region that suits them best.

This ability to speak was of great value because it allowed men to share ideas, and to plan together, so that tasks impossible for a single person could be successfully undertaken by intelligent team-work.
查看答案