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【单选题】
对于下列化合物命名正确的是:
A.
2- 噻吩磺酸
B.
1- 噻吩磺酸
C.
1- 磺酸噻吩
D.
2- 磺酸 噻吩
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举一反三
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【单选题】当被摄体以浅亮色调为主,或主体位于大面积明亮背景前,拍摄按平均测光会导致()。
A.
互易率失效
B.
曝光过度
C.
曝光不足
D.
眩光
【单选题】具有“花环型”结构的植物是( )。
A.
C 4 植物
B.
C 5 植物
C.
CAM植物
D.
以上答案都不对
【单选题】—We haven’t heard from Jane for a long time . — What do you suppose to her?
A.
. was happening    
B.
. tohappen  
C.
. has happened   
D.
. having happened
【简答题】“花环型”结构
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