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【单选题】
电压微分负反馈及电流微分负反馈是属于()环节。A.
反馈环节
B.
稳定环节
C.
放大环节
D.
保护环节
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】What's wrong with the man?
A.
He was knocked down by a car.
B.
He had an accident when he was walking along the street.
C.
He had an accident in the car.
【单选题】The search for eternal youth is no less fervent now than it was 2,000 years ago. People are trying practically anything.
A.
prolonged
B.
external
C.
protracted
D.
excessive
【单选题】Walking in the street, ______ .
A.
a bike had knocked him down
B.
he was knocked down by a bike
C.
a bike knocked him down
D.
he knocked down a bike
【单选题】Why was the man late for the opera?
A.
Because he was knocked down by the car and was seriously injured.
B.
Because he was too busy to remember the exact time of the opera.
C.
Because he had to comfort his sister whose boyfriend was badly injured.
D.
Because he was struck in the traffic jam and could hardly move forward.
【单选题】After he was knocked down by a bike, he was badly hurt and had to ______ to his feet.
A.
stand
B.
struggle
C.
run
D.
sit
【单选题】What happened to the man?
A.
He was knocked down by a bicycle.
B.
He was followed by a woman.
C.
His money was stolen.
D.
He was robbed of his left shoe.
【单选题】When his brother was to cross the street, he was knocked down by a truck and badly ____.
A.
injured
B.
damaged
C.
harmed
D.
destroyed
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