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【单选题】
若两动机调速特性有显著差异的同步发电机并联经一段时间运行后（自动调频调载装置未投入），由于有功负载的变动，则（）。A.
有功负载分配不再均匀
B.
机组间功率震荡
C.
有功负载分配仍保持均匀
D.
一定导致一台发电机逆功跳闸
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举一反三
【简答题】局域网常用的拓外结构有()、()和 () 三种。
【单选题】For some reason, it __________ all day over the two weeks.
A.
rained
B.
rains
C.
was raining
D.
has been raining
【单选题】.Mary was _________ the letter from Tom,but it didn’t reach her for some reason.
A.
expecting
B.
waiting
C.
hoping
D.
longing
【简答题】For some people, it may be better ________. A) to wear a seat belt for health reasons B) not to wear a seat belt for health reasons C) to get valid medical certificate before wearing a seat belt D) to...
【简答题】For some reason, it takes constant reminders that we primates （灵长目）need nurturing. In a recent study of 46 baby chimpanzee （黑猩猩）orphans, Kim Bard of the University of Portsmouth in England and her col...
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