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【简答题】
电路过渡过程的性质取决于电路元件的 参数。当电路为“过阻尼”状态时,R( ) ;当电路出现“欠阻尼”状态时,R( ) 。
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举一反三
【单选题】Hardly the helicopter _______ when the waiting crowd ran toward it.
A.
had...landed
B.
has...landed
C.
did...landed
D.
was... landing
【简答题】Hardly ________ the helicopter ________ when the waiting crowd ran toward it. A) had ..., landed B) has ..., landed C) did..., land D) was..., landing
【单选题】A small fuel spillage has occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by，the next step is to（）.
A.
proceed with fueling operation
B.
have helicopter move to a safer location
C.
wash spilled fuel away with a flood of water
D.
clean spilled fuel with rags
【单选题】The FBI has been called in to help __________ the tragic helicopter crash that killed NBA champion Kobe Bryant, and his teenage daughter.
A.
neglect
B.
investigate
C.
insert
D.
emerge
【单选题】Hardly_____ the helicopter______ when the waiting crowd ran towards it.
A.
has…landed
B.
had…landed
C.
would…land
D.
was…landing
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