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【简答题】
如图所示为三相桥式PWM逆变电路,采用双极性控制方式,U、V和W三相的PWM控制共用一个三角波载波uc,若要输出SPWM波,则三相的调制信号urU、urV和urW必须为 信号,并且 依次相差 ,其输出的线电压为 电平,分别是 ;其输出的相电压为 电平,分别是 。
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参考答案:
举一反三
【单选题】— I wonder if I could take a few days off work. — ________ .
A.
I’m sure you could leave off work
B.
I should say a few days is no problem
C.
Why, what’s the matter with you
D.
No, you mustn’t go away
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【单选题】My friends share their stories with me.
A.
my friends
B.
share
C.
their
D.
stories
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【单选题】——Could I use your English dictionary for a few moments? —— ________.I’m not using it myself.
A.
Come on
B.
It depends
C.
Go ahead
D.
That’s great
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【单选题】— Can I take your order now? — ____. Could I have a few more minutes? [ ]
A.
No way
B.
Go ahead
C.
Not quite
D.
No good
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【单选题】-- Could I use your computer for a few moments, please? --- ________. I’m not using it myself.
A.
Come on
B.
It depends
C.
Go ahead
D.
That’s great
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【单选题】My father is so kind thak he is to all of my friends. [ ]
A.
friend
B.
friends
C.
friendly
D.
friendship
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【单选题】----Could I use your computer for a few moments, please? -----______.I’m not using it myself.
A.
Go ahead
B.
Come on
C.
Take care
D.
Hold on
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【简答题】— Could I use your computer for a few moments, please?—__________. I’m not using it myself. A.Come on B.It depends C.Go ahead D.That’s great
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【单选题】What is NOT mentioned as the things my Facebook friends know about me?
A.
My friends in real life.
B.
The place where I spent my holiday.
C.
The dishes I cooked.
D.
My idea about a movie.
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【简答题】句型转换(每空一词)。 1.1 want to borrow some money from my friends.(改为同义句) I hope my friends________ some money________ me. 2. Please buy some drinks and snacks for us.(改为否定句) Please________ ________ ________ ...
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相关题目:
【单选题】— I wonder if I could take a few days off work. — ________ .
A.
I’m sure you could leave off work
B.
I should say a few days is no problem
C.
Why, what’s the matter with you
D.
No, you mustn’t go away
查看完整题目与答案
【单选题】My friends share their stories with me.
A.
my friends
B.
share
C.
their
D.
stories
查看完整题目与答案
【单选题】——Could I use your English dictionary for a few moments? —— ________.I’m not using it myself.
A.
Come on
B.
It depends
C.
Go ahead
D.
That’s great
查看完整题目与答案
【单选题】— Can I take your order now? — ____. Could I have a few more minutes? [ ]
A.
No way
B.
Go ahead
C.
Not quite
D.
No good
查看完整题目与答案
【单选题】-- Could I use your computer for a few moments, please? --- ________. I’m not using it myself.
A.
Come on
B.
It depends
C.
Go ahead
D.
That’s great
查看完整题目与答案
【单选题】My father is so kind thak he is to all of my friends. [ ]
A.
friend
B.
friends
C.
friendly
D.
friendship
查看完整题目与答案
【单选题】----Could I use your computer for a few moments, please? -----______.I’m not using it myself.
A.
Go ahead
B.
Come on
C.
Take care
D.
Hold on
查看完整题目与答案
【简答题】— Could I use your computer for a few moments, please?—__________. I’m not using it myself. A.Come on B.It depends C.Go ahead D.That’s great
查看完整题目与答案
【单选题】What is NOT mentioned as the things my Facebook friends know about me?
A.
My friends in real life.
B.
The place where I spent my holiday.
C.
The dishes I cooked.
D.
My idea about a movie.
查看完整题目与答案
【简答题】句型转换(每空一词)。 1.1 want to borrow some money from my friends.(改为同义句) I hope my friends________ some money________ me. 2. Please buy some drinks and snacks for us.(改为否定句) Please________ ________ ________ ...
查看完整题目与答案
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