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【单选题】
若电路中某元件两端的电压为u=10sin(314t+45°)V，电流i=5sin(314t+135°)A，则该元件是（ ）A.
电感
B.
电阻
C.
电容
D.
电抗
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举一反三
【单选题】To our delight, these peasants first ______ of poverty are not only widening their roads to wealth, but doing what they can to help others in need. [ ]
A.
to rid
B.
rid
C.
ridding
D.
having rid
【单选题】Only about six percent of the world __________ English __________ the first language. [ ]
A.
speaks, as
B.
speak, as
C.
speak , to
【单选题】What meals did the first diners serve?
A.
Only breakfast.
B.
Only lunch.
C.
Only late-night meals.
D.
Only supper
【单选题】_______ was the first and the only American playwright to be awarded the Nobel Prize for Literature .
A.
Arthur Miller
B.
Eugene O‘Neill
C.
Tennessee Williams
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