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【简答题】
一半导体激光器,谐振腔长L=300um,工作物质的损耗系数 ,谐振腔两端面的反射率 ,求激光器的阈值增益系数 。若后镜面的反射率提高到 ,求阈值时的增益以及阈值电流的变化。(教材95页12题)
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【判断题】最小的语音单位是音素。(    )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Diesel engines obtain combustion air through turbo chargers，blowers，or ______．
A.
Air starters
B.
Carburetors
C.
Natural aspiration
D.
Air receivers
查看完整题目与答案
【单选题】A hundred years ago, the game we now call football did not exist. American football started during a game between two colleges. The teams had got together to play what they called 'football', but each...
A.
the rules of soccer
B.
the rules of rugby
C.
different rules
D.
college rules
查看完整题目与答案
【判断题】普通话一个音节，最少是两个音素，最多是五个音素。(    )
A.
正确
B.
错误
查看完整题目与答案
【单选题】When the researchers excluded seven people who were already infected when the trial started, ______.
A.
those seven people were in favor of the vaccine very much.
B.
the effect of vaccine was significant.
C.
it showed that people were less likely to be infected by taking vaccine.
D.
it showed the vaccine can reduce the risk of being infected for all the people.
查看完整题目与答案
【单选题】可以归并在同一个音位中的音素是()。
A.
具有互补关系、语音上又相似的音素
B.
语音上相似的音素
C.
彼此能区分词的语音形式和意义的音素
D.
具有非对立性关系的音素
查看完整题目与答案
【单选题】请在第__（54）__处填上正确答案。 查看材料
A.
stopped
B.
started
C.
kept
D.
continued
查看完整题目与答案
【简答题】一般同一类石油沥青随着牌号的增加，其针入度()，延度()而软化点()。
查看完整题目与答案
【单选题】下列关于音素说法（）是正确的。
A.
处于互补关系中的几个音素，是同一个音位。
B.
处于互补关系中的几个音素，是不同的音位。
C.
具有对立关系的几个音素，是同一个音位。
D.
具有对立关系的几个音素，是同一个音位的变体。
查看完整题目与答案
【单选题】SLEW:
A.
inappropriate understanding
B.
insecure resource
C.
unwelcome intrusion
D.
humble start
E.
restricted number
查看完整题目与答案
相关题目：
【判断题】最小的语音单位是音素。(    )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Diesel engines obtain combustion air through turbo chargers，blowers，or ______．
A.
Air starters
B.
Carburetors
C.
Natural aspiration
D.
Air receivers
查看完整题目与答案
【单选题】A hundred years ago, the game we now call football did not exist. American football started during a game between two colleges. The teams had got together to play what they called 'football', but each...
A.
the rules of soccer
B.
the rules of rugby
C.
different rules
D.
college rules
查看完整题目与答案
【判断题】普通话一个音节，最少是两个音素，最多是五个音素。(    )
A.
正确
B.
错误
查看完整题目与答案
【单选题】When the researchers excluded seven people who were already infected when the trial started, ______.
A.
those seven people were in favor of the vaccine very much.
B.
the effect of vaccine was significant.
C.
it showed that people were less likely to be infected by taking vaccine.
D.
it showed the vaccine can reduce the risk of being infected for all the people.
查看完整题目与答案
【单选题】可以归并在同一个音位中的音素是()。
A.
具有互补关系、语音上又相似的音素
B.
语音上相似的音素
C.
彼此能区分词的语音形式和意义的音素
D.
具有非对立性关系的音素
查看完整题目与答案
【单选题】请在第__（54）__处填上正确答案。 查看材料
A.
stopped
B.
started
C.
kept
D.
continued
查看完整题目与答案
【简答题】一般同一类石油沥青随着牌号的增加，其针入度()，延度()而软化点()。
查看完整题目与答案
【单选题】下列关于音素说法（）是正确的。
A.
处于互补关系中的几个音素，是同一个音位。
B.
处于互补关系中的几个音素，是不同的音位。
C.
具有对立关系的几个音素，是同一个音位。
D.
具有对立关系的几个音素，是同一个音位的变体。
查看完整题目与答案
【单选题】SLEW:
A.
inappropriate understanding
B.
insecure resource
C.
unwelcome intrusion
D.
humble start
E.
restricted number
查看完整题目与答案