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【单选题】
与乙类功率放大电路相比,甲乙类功率放大电路的特点是( )。A.
提高了效率
B.
消除了饱和失真
C.
消除了交越失真
D.
以上均是
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举一反三
【简答题】我国《商标法》除保护商品商标外还保护 ( )。 A．服务商标 B．立体商标 C．气味商标 D．集体商标
【单选题】—Your father is cleaning the car. Is Tom helping? — . He is playing football. [ ]
A.
Yes , he is
B.
No , he isn't
C.
Yes , he has
D.
No, he doesn't
【简答题】Listen and judge. ( )1. Jack is playing the violin. ( )2. Lucy is playing the piano. ( )3. Mike is playing the erhu. ( )4. Lisa is singing a song. ( )5. Amy and May are playing gam...
【单选题】---A car knocked Jack down while he was playing on his way home. ---Really? We are told in the street.
A.
not playing
B.
not play
C.
don’t play
D.
not to play
【简答题】全面预算体系包括______、______和______三大组成部分；其中______是编制全面预算的基础。
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