题目内容
(请给出正确答案)
[单选题]
在我国电力系统中,动力和照明用电的频率为____Hz,称工频,其周期为____s。
A.60,0.015
B.60,0.020
C.50,0.020
D.50,0.015
提问人:网友tsxcyw
发布时间:2022-01-07
A.60,0.015
B.60,0.020
C.50,0.020
D.50,0.015
B、120度,240度
C、120度,60度
D、60度,120度
为了保护您的账号安全,请在“简答题”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!