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【单选题】
在下列说法中只有()说法是正确的。A.
P型半导体可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型半导体带正电，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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皮皮学刷刷变学霸
举一反三
【单选题】测定溶液的PH时,仪器定位后,要用第二种标准缓冲液核对仪器示值,误差应不大于( )个PH单位
A.
±0.05pH
B.
±0.04pH
C.
±0.03pH
D.
±0.02pH
【单选题】I play tennis but ______ my brother does.
A.
not half as well as
B.
not half as well than
C.
not half better than
D.
not half so better as
【简答题】用used to或一般现在时完成句子. 1. I play tennis. I stopped playing a few years ago. 2. Do you do any sport? Yes, I . 3. 'Have you got a car?' 'No, I __________ one but I sold it.' 4. George __________ a waiter. ...
【单选题】-Do you play football, Rosie? -I ________, but now I play tennis.
A.
used to
B.
was used to
C.
use to
D.
am use to
【单选题】I play tennis every Tuesday. Last week, I was playing with John, a man I am knowing from work, when a bird flew into the tennis net.
A.
was playing
B.
play
C.
am knowing
D.
flew
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