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【单选题】
PN结是P、N区( )的一个空间电荷区。A.
交界面处
B.
两侧
C.
共有
D.
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举一反三
【简答题】知x>0,y>0,x+2y+xy=30,求xy的取值范围.
【简答题】样本(sample)
【单选题】— I hear Daming has gone to Hainan Island for his holiday. — Oh, how nice! Do you know when he ? [ ]
A.
was leaving
B.
had left
C.
has left
D.
left
【简答题】己知：|x|=4，y 2 = 1 49 ；且x＞0，y＜0，求2x-7y的值．
【单选题】—I hear Sam has gone to Qingdao for his holiday. —Oh, how nice ! Do you know when he ? [ ]
A.
left
B.
was leaving
C.
has left
D.
had left
【简答题】样本 (sample)
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