题目内容

电机故障产生的原因()。

A. 脉冲编码器发生故障,电动机的位置没有正确传递到控制装置,导致电机抖动
B. 电动机主体部分发生故障,不能发挥其原有的性能
C. 因某种原因而输入了与规定值不同的动作控制用变量
D. 机构部件和控制装置的连接电缆快要断线

查看答案
更多问题

造成电机过流故障的原因正确的是( )。

A. 电机UVW电缆短路
B. 电机电缆接触不良
C. 电机转的太快
D. 电机负载太大

出现电机过热的原因可能有以下几个方面:

A. 电源电压过高或者下降过多;
B. 轴承缺油或者损坏。
C. 电机过载运行;
D. 空气过滤器选件阻塞;

Listen to a dialogue and decode the message by finding the correct choices inbrackets according to what you have heard.[音频]Mr. Anderson is shopping at a department store. He wants to buy some 1 silk, pottery, jewelry . He asks the shop assistant for something a little 2 darker, brighter, lighter . The assistant shows him the design with blue and yellow 3 birds, cats, dogs . He likes the 4 color, size, design and wants to buy one and half meters for his 5 wife, sister, daughter to make a short-sleeved dress. It will cost him one hundred and forty yuan.

Listen to a monologue (独白) of a job hunter twice and during the second listening,put back the missing words in the blanks.[音频]From 2004 to 2008, I worked as a salesman with ABC International Trade, responsible for the 1 ___________ of Europe. During that period, I got excellent 2 ___________ to use German in the letters and phone calls for 3 ___________ business in that country. I also translated some technical 4 ___________ and the Siemens’ operating instructions from 5 ___________ to Chinese.Through working in many 6 ___________ countries, I found that my success in work owes 7 ___________ to my effective communication with people, plus my 8 ___________ and strong ability to use the 9 ___________. Therefore I firmly 10 ___________ I am qualified for this job.

答案查题题库