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【单选题】
在本征半导体中加入 元素可形成P型半导体。A.
五价
B.
四价
C.
三价
D.
以上都不是
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【简答题】The 5th sentence (This ... position.)
【单选题】In the 10th and11th centuries in southern European, women’s social position was ______.
A.
higher than men’s
B.
as high as men’s
C.
lower than men’s
D.
never recognized
【单选题】A neutral equilibrium position for a vessel means that the metacenter is ______.
A.
lower than the keel
B.
at the same height as the center of gravity
C.
exactly at midships
D.
at the center of the waterplane area
【判断题】English has a complex system of consonant clusters, in which two or more consonants occur in sequence in onset or coda position.
A.
正确
B.
错误
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