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【单选题】
一电阻上的电压电流为非关联参考方向,电压为 -10V ,提供功率为 5W ,则该电阻值为( )。A.
20 Ω
B.
-20 Ω
C.
± 20 Ω
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举一反三
【单选题】—Did your dad fix the brakes on the BMW himself? —He , because he doesn’t know much about cars.
A.
has it fixed
B.
had fixed it
C.
fixed it
D.
had it fixed
【简答题】Did your dad watch TV yesterday evening? No, he______.
【单选题】----What did your dad tell you, my baby? ----He said the sun _______ in the east.
A.
went up
B.
will go up
C.
goes up
D.
is going up
【单选题】A: Did your dad watch TV yesterday evening? B: No, he __________. He went to the cinema.
A.
was
B.
did
C.
wasn't
D.
didn't
【单选题】—Alan, come here. I need your help. —Sorry, Dad. I ________ the dishes now. [ ]
A.
do
B.
did
C.
am doing
D.
was doing
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