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【单选题】
数列有界是数列收敛的
A.
充分条件
B.
必要条件
C.
充要条件
D.
既不充分也不必要
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【单选题】以下器件中属于电流驱动器件的是()。
A.
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B.
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C.
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D.
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【多选题】下列属于电流驱动型器件,且还是全控器件的是
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B.
GTR
C.
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D.
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【单选题】下列全控型器件中属于电流驱动型器件的是( )
A.
GTR ， MOSFET
B.
GTO ， GTR
C.
MOSFET ， IGBT
D.
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【判断题】电力电子器件中 属于电压驱动的 是 电力MOSFET 、IGBT ,属于电流驱动的是 晶闸管、GTO 、GTR 。
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正确
B.
错误
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【简答题】In Chinese, we often use commas in between a series of thoughts, and end with a period; while in English, ­­­______ are used to mark the end of each complete sentence.
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【单选题】Which one is NOT the method of conclusion we have learned in this unit?
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B.
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【单选题】在债券到期前的特定时段有权以事先约定的价格将债券回售给发行人的是（ ）。
A.
可交换债券
B.
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C.
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D.
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【简答题】阅读理解 Reading Oliver James' Affluenza ,I thought about what often happens at home.My 12-year-ole daughter is in tears.'I have so take a test tomorrow.I don't understand any of it,'she cries out.After s...
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【单选题】以下器件中属于电流驱动器件的是()。
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