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【单选题】
下列说法中正确的是( )A.
p型半导体可以通过在纯净半导体中掺入五价磷元素而获得
B.
在N型半导体中，掺入 高浓度的三价杂质可以改型为P型半导体
C.
P型半导体带正点，N型半导体带负电
D.
PN结内的扩散电流是载流子在电场作用下形成的
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反馈参考答案：
举一反三
【单选题】When asked by the police, he said that he remembered ______ at the party, but not
A.
to arrive; leaving
B.
to arrive; to leave
C.
arriving; leaving
D.
arriving; to leave
【单选题】听力原文： The train I was traveling on was already half an hour late. I had planned to arrive in Chicago at 7:00 in time to catch the 7:50 train to St. Louis, but there was no hope of that now. I explaine...
A.
At 7:00.
B.
At 7:50.
C.
In time.
D.
Behind its time.
【单选题】“When will your father _________ Shanghai?” “He ________ at 8:00 this Monday.”
A.
arrive at, will arrive
B.
arrive in , will arrive
C.
arrive ,will arrive in
D.
arrive, will arrive at
【简答题】— Sorry for being late. I should have called you earlier. —__________. I've just arrived A: That's no trouble B; You are welcome C; That's all right
【单选题】Hello! I'm glad to see you here. When _____ you _____? [ ]
A.
did, arrive
B.
will arrive
C.
have, arrived
D.
are arriving
【单选题】Jane was disappointed that most of the guests when she at the party.
A.
left; had arrived
B.
left; arrived
C.
had left; had arrived
D.
had left; arrived
【单选题】_________, they delivered the message as quickly as they could.
A.
Arriving at
B.
On arriving
C.
When arriving
D.
Arrived
【单选题】我国居民有将许多食物混合食用的传统食用习惯,其中之一是腊八粥,其理论基础是:
A.
氨基酸模式
B.
蛋白质互补作用
C.
蛋白质功效比值
D.
蛋白质生物价
E.
食物热效应
【单选题】I f yo u nee d an y thi n g fr o m us , pl e as e fee l fre e t o （ ） th e cal l but t o n dur i n g the whole flight.
A.
press
B.
click
C.
push
D.
pull
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