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【单选题】
比较两组数据的离散程度,不能直接用它们的标准差,因为两组数据的A.
标准差不同
B.
方差不同
C.
计量单位不同
D.
数据个数不同
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【简答题】They were unable to think of an alternative ____ selling an equity stake.
【单选题】以下电力电子器件中既是全控型器件又是电压驱动型的器件是
A.
IGBT , GTO
B.
电力 MOSFET , GTR
C.
IGBT , 电力 MOSFET
D.
GTO , GTR
【单选题】If you _____ a great soccer player, you _____ a lot of money. [ ]
A.
becomes; can make
B.
will become; will make
C.
become; made
D.
become; will make
【简答题】You can change the sound of your music to become more professional by adding ______.
【简答题】全控型电力电子器件GTO和GTR是( )驱动型器件?
【简答题】You can experience a fast internet connection in the same way as you do in the office A.more B.much C.better D.most
【单选题】以下电力电子器件中既是全控型器件又是电流驱动型的器件是
A.
IGBT , GTO
B.
电力 MOSFET , GTR
C.
IGBT , 电力 MOSFET
D.
GTO , GTR
【简答题】GTO是 驱动型电力电子器件。
【单选题】They were unable to _____ the telephone network economically.
A.
work
B.
set
C.
run
D.
take
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