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【判断题】
有制动作用的 PWM 变换电路中, 0< t < ton时, VT 2 饱和导通 。( )A.
正确
B.
错误
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举一反三
【简答题】The China Import and Export Fair, also called The Canton Fair, has been held twice a year in Spring and Autumn since it was inaugurated in the Spring of 1957. It is sponsored by the Ministry of Commer...
【简答题】Where is Tom? I have something important to tell him. ― I last saw him (seat)in the library reading.
【单选题】---I have been waiting here for . But where is Tom? ---He is on his way back now.
A.
sometime
B.
some time
C.
sometimes
D.
some times
【单选题】— Where is Tom? I have something important to tell him. — I last saw him____in the library reading. [ ]
A.
sit
B.
seated
C.
seating
D.
sat
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