变电所计算机监控系统的电源应安全可靠,站控层设备宜采用交流不停电电源(UPS)供电,不间断电源的后备时间应不小于()。
A.0.5小时
B.1小时
C.2小时
D.8小时
参考答案:B
在对话空白处填入一个适当的话语.使对话完整并正确。
Woman: __1__
Girl: Yes, I want a shirt,please.
Woman: Do you like the white one?
Girl: __2__ . That yellow one looks nice.
Woman:Yes. Please try it on.
Girl: Oh, __3__ .Could you give me a short one?
Woman: Certainly. Here you are.
Girl: Good. This is nice. __4__ ?
Woman: 55 dollars.
Girl: Here's the money.
Woman: __5__ .
控制计量器使用状态的检定是()。
A.修理后检定
B.使用中检定
C.后续检定
D.周期检定