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【判断题】
SPWM 脉宽调制型逆变电路中,采用不可控整流电源供电,也能正常工作 。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】A．He has a headache. B．He failed his history exam. C．He is sleepy. D．He is too busy.
【单选题】A) He has just too many things to attend to. B) He has been overworked recently. C) He has a difficult decision to make. D) He has just quarreled with his girlfriend.
A.
B.
C.
D.
D
【单选题】He has too ______ a nature to get angry, even if he has good cause.
A.
slight
B.
mild
C.
light
D.
loose
【单选题】What is the man's problem?
A.
He hasn't received an important report.
B.
He has too many expenses.
C.
He cannot contact the courier.
D.
He missed a deadline.
【简答题】A．He has a headache. B．He failed his history exam. C．He is tired. D．He is too busy.
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