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【简答题】
在 N 型半导体中,多数载流子是 ;在 P 型半导体中,主要靠多数载流子 导电。
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反馈参考答案：
举一反三
【单选题】The following statements about educational background are correct EXCEPT .
A.
Educational background is about the levels of education you have received.
B.
Schools should be listed according to importance degree.
C.
The most recent educational information is usually put first.
D.
Educational background is usually put from the higher educational level to the lower.
【单选题】成品无牙颌托盘应满足下列哪项（）
A.
托盘宽度比牙槽嵴宽2～3mm
B.
托盘边缘高度应离开黏膜皱襞2～3mm
C.
上颌托盘腭侧至颤动线后3～4mm
D.
托盘若边缘稍短时，可用蜡片或印模膏加长
E.
以上均是
【判断题】The advantage of the educational system in North America is that students learn to think for themselves.()
A.
正确
B.
错误
【简答题】教育心理学(educational psychology)
【简答题】A.supervisory B.instructive C.tutorial D.educational
【多选题】成品无牙颌托盘应满足下列哪项
A.
托盘宽度比牙槽嵴宽2～3m
B.
托盘边缘高度应离开黏膜皱襞2～3mm
C.
上颌托盘腭侧至颤动线后3～4mm
D.
托盘若边缘稍短时，可用蜡片或印模膏加长
【单选题】The best title for this passage might be ______.
A.
The Discriminatory Educational Policies in the 1950s and 1960s
B.
The Demand for Educational Reform. in the 1950s and 1960s
C.
The Racial Problems in Schools in the 1950s and 1960s
D.
The Educational Reforms in the 1950s and 1960s
【简答题】[A] educational [B] political [C] commercial [D] social
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