单选题:在电力工程直流电源系统设计时,对于交流电源事故停电时间的确定,下列哪一项是不正确的?( )

题目内容:
在电力工程直流电源系统设计时,对于交流电源事故停电时间的确定,下列哪一项是不正确的?( ) A.与电力系统连接的发电厂,厂用交流电源事故停电时间为1h
B.不与电力系统连接的孤立发电厂,厂用交流电源事故停电时间为2h
C.直流输电换流站,全站交流电源事故停电时间为2h
D.无人值班的变电所,全所交流电源事故停电时间为1h

参考答案:
答案解析:

The hotel is almost finished, but it __________needs one or

The hotel is almost finished, but it __________needs one or two weeks to get re

查看答案

Tom took a taxi to the airport, only __________ his plane hi

Tom took a taxi to the airport, only __________ his plane high up in the sky.A.

查看答案

This is not my story, nor__________the whole story.My story

This is not my story, nor__________the whole story.My story plays out differentl

查看答案

“五更钟漏欲相催,四气推迁往复回。帐里残灯才去焰,炉中香气尽成灰。渐看春逼芙蓉枕,顿觉寒销竹叶杯。守岁家家应未卧,相思那

“五更钟漏欲相催,四气推迁往复回。帐里残灯才去焰,炉中香气尽成灰。渐看春逼芙蓉枕,顿觉寒销竹叶杯。守岁家家应未卧,相思那得梦魂来。”这首诗描写的节日是:A.中秋

查看答案

--Goodbye, John.Come back again sometime.--Sure.__________ .

--Goodbye, John.Come back again sometime.--Sure.__________ .A.I did B.I do C.I

查看答案