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【单选题】
下面关于实际三极管的内部结构特点，描述不正确的是（ ）。A.
基区要求较薄，且掺杂质浓度低。
B.
发射区，要求掺杂质浓度较高。
C.
任意三个掺杂质的区，具有二个 PN 结，引出三根导线电极，就能构成三极管的。
D.
集电区则要求集电结的结面积较宽。
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【单选题】下列与光现象有关的说法中错误的是( ) A .手影是根据光的直线传播形成的 B .老花镜的镜片是用凸透镜制成的 C .照相机利用了凸透镜能成倒立缩小的虚像的原理 D .色光的三原色是红、绿、蓝
A.
B.
C.
D.
D
【单选题】Paul was feeling a bit ____ then, for he had no friends.
A.
active
B.
lone
C.
lonely
D.
selfish
【简答题】如图(a)所示电路，已知U s =2V，R 1 =R 2 =2Ω，非线性电阻的伏安特性为i=f(u)=2u 2 (u＞0)。
【单选题】He was by nature a sociable, chatty man and he had reckoned that his action would () produce conversation
A.
infallibly
B.
bounced
C.
concentrate
D.
acclamation
【单选题】Passage two ( 1 ) PAUL was dissatisfied with himself and with everything. The deepest of his love belonged to his mother. When he felt he had hurt her, or wounded his love for her, he could not bear i...
A.
. indifferent
B.
. desperate
C.
pessimistic
D.
ambiguous
【简答题】Paul was feeling a bit ____ then, for he
had no friends.A. active B. lone C. lonely D. selfish
相关题目：
【单选题】Paul was feeling a bit ____ then, for he had no friends.
A.
active
B.
lone
C.
lonely
D.
selfish