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【简答题】
任何一个元件的电压 u与电流i取非关联参考方向时,当流经元件的电流电压实际方向相同时,元件 功率,电流电压实际方向相反时,元件 功率。
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举一反三
【简答题】A．The tickets are only available on unpopular times. B．They want people to travel when trains are not normally full. C．They want to encourage business people to travel at midday. D．They want to make p...
【简答题】A．The tickets are only available on unpopular times. B．They want people to travel when trains are not normally full. C．They want to encourage business people to travel at midday. D．They want to make p...
【单选题】A lot of people find it useful to have a phrasebook when they travel to a country _____they don’t know the language．
A.
where
B.
when
C.
why
D.
which
【简答题】在○里填上“+”、“-”或“×”。 4○4=16 3○3=9 6○6=0 5○6=30 5○5=25 4○6=10 5○3=15 5○3=2
【单选题】When people travel on business(出差) ,they usually take _________ ．A． a train or a
A.
29． When people travel on business(出差) ,they usually take _________ ． A． a train or a plane
B.
a boat or a train
C.
a car or a boat ．
D.
a plane or a car
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