皮皮学，免费搜题
登录
搜题
【单选题】
下述关于使用便携式兆欧表测定交流电动机定子线圈对地绝缘的方法,叙述正确的是 1测量绝缘电阻时,应根据设备额定工作电压的大小选用合适等级的兆欧表;2测量前对兆欧表进行一次开路和短路试验,检查仪表是否良好;3测量对地绝缘时,可以在通电运行兆欧表的E接线柱接到交流电动机导电良好的外壳上,L接线柱接到定子线圈的接线端子上;4摇动兆欧表至额定转速,指针稳定后所指刻度值为此线圈的匝间绝缘电阻值。A.
②③
B.
①②
C.
②④
D.
①④
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】How often did the family finally decide to have meals together?
A.
Every Sunday.
B.
Twice a week.
C.
Three times a week.
【简答题】A. us British B. British us C. us Britain D. we British
【单选题】The British Empire was replaced by the British Commonwealth or the Commonwealth of Nations in ______.
A.
1921.
B.
1931.
C.
1945.
D.
1950.
【单选题】In which of the following situations should we use the expression nowadays?
A.
We decide to avoid trouble or danger for the future.
B.
We try to improve our English for better education.
C.
We need to make a quick decision at the last moment.
D.
We have to make a choice between success and failure.
【简答题】At the height of the British Empire , there were British colonies on every continent. ( )
【简答题】It is reported that the British men have more savings than the British women.
【单选题】We wish to develop a confidence interval for the population mean. The population standard deviation is known. We have a sample of 40 observations. We decide to use the 92 percent level of confidence. ...
A.
1.96.
B.
1.65.
C.
2.58.
D.
1.75.
【简答题】What does a typical British house have?A typieal British house has ______.
【单选题】What is the full name of BBC?
A.
British Broadcasting Cooperation
B.
British Broadcasting Company
C.
British Broadcasting Corporation
D.
British Broadway Cooperation
相关题目：
参考解析：
知识点：
题目纠错 0
发布
