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【简答题】
说明直流电机电刷和换向器的作用，在发电机中它们是怎样把电枢绕组中的交流电动势变成刷间直流电动势的?在电动机中，刷间电压本来就是直流电压，为什么仍需要电刷和换向器?
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反馈参考答案：
举一反三
【简答题】先化简，再求值： 6 m 2 -9 ÷ 2 m-3 - m m+3 ，其中m=2．
【单选题】Unable to defeat him by logical discussion, she ______ her old habit of criticizing his speech.
A.
fell back on
B.
looked down upon
C.
lived up to
D.
hanged on to
【单选题】I dont think it is advisable that she ______ her little boy of his freedom to spend the spare time as he wish.
A.
deprive
B.
deprives
C.
deprived
D.
has deprived
【单选题】Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 (SP2). All client computers run Windows XP Professional Service Pack 3 (SP3). You create a...
A.
Modify the properties of User1’s account.
B.
Modify the properties of the computer account.
C.
On User1’s computer, create a local user account.
D.
On User1’s computer, modify the local security policy.
【单选题】Betty is always interested__________________ space science. She wishes to fly in a spaceship one day.
A.
with
B.
in
C.
by
D.
at
【简答题】先化简，再求值： m m+3 - 6 m 2 -9 ÷ 2 m-3 ，其中m=-2．
【单选题】听力原文：M: Do you think Susan could help us plan the trip to Canada? W: Well, since she spends every winter there, she might know a thing or two about it. Q: What does the woman mean? (14)
A.
Susan will help if she's there this winter.
B.
Canada has many unexplored areas.
C.
Susan would probably be a good person to ask.
D.
The tourists should try to get a lot of information.
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