皮皮学，免费搜题
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【单选题】
RL 电路产生动态过程的原因是因为存在 ( )。A.
动能量
B.
磁场能量
C.
光能量
D.
电场能量
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皮皮学刷刷变学霸
举一反三
【单选题】—How many souvenirs _____ you _____ in the shop? —I bought only one. [ ]
A.
did, bought
B.
does, buy
C.
did, buy
【单选题】He has spent money on books.
A.
plenty of
B.
a large amount of
C.
a large number of
D.
a great many 22. My dear friends, please study hard. Don’t our country and our
【单选题】He has spent money on the house.
A.
hostility
B.
previous
C.
affectionate
D.
excessive
E.
safe
【简答题】满足叠加原理的系统是（）系统。
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