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【判断题】
在分压式偏置电路中,晶体管的电流放大系数 β = 50 ,若将该管调换为 β = 80 的另外一个晶体管,则该电路中晶体管集电极电流 I C 将减小。A.
正确
B.
错误
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【简答题】The following chart shows the number of scholars returning from overseas over the past years. Study the following chart carefully and write an essay in which you should 1) describe the chart, 2) accou...
【单选题】Degraded Land in South China Damaging agricultural and forestry practices over the past years have degraded half of the land in China bounded by the Tropic of Cancer and the South China Sea, dramatica...
A.
Y
B.
N
C.
NG
【单选题】The author mentions the fact that Andy has changed her computers 5 times in the past 9 years with the intention to illustrate that e-waste is a wide-spread problem.
A.
Y
B.
N
C.
NG
【单选题】It suddenly occurred to Anne that money couldn’t ____ all that Bob had suffered in the past five years.
A.
make up for
B.
look up to
C.
put up with
D.
fit in with
【单选题】It suddenly occurred to Anne that money couldn't ____ all that Bob had suffered in the past five years.
A.
look up to
B.
put up with
C.
fit in with
D.
make up for
【单选题】Professor Johnson is said to have made some ______ advance in his research in the past year.
A.
extensive
B.
significant
C.
fundamental
D.
dominant
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