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【简答题】
升降压斩波电路(又称Buck boost电路)的输出电压平均值可以大于或小于输入直流电压,输出电压与输入电压极性 。
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举一反三
【单选题】______ deserted by his guide, there seemed little hope that the explorer would find his way through the jungle.
A.
Being
B.
Be
C.
Have
D.
Having been
【简答题】根据车船税法律制度的规定，下列各项中，属于载客汽车计税依据的是（ ）。
【简答题】exhaustion of local remedies
【单选题】Will was stupefied with exhaustion, and he _____ his head on the grass under one of the trees and slept, but he saw a cat acting strangely.
A.
should have lied
B.
ought to have lay
C.
might have laid
D.
must have laid
【单选题】With his work completed, the manager stepped back to his seat, feeling pleased()he was a man of action.
A.
which
B.
what
C.
that
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