He asked, "Where are you toget off, John?"He asked John where _____________ get off.
A. was he to
B. he was to
C. does he to
D. would he to
查看答案
Which sentences are right?
A. Can you tell me where is the hospital?
B. Can you tell me wherethe hospital is?
C. I don't know whether does he speak Chinese.
D. I don't know whether he speaks Chinese.
下列化合物能产生旋光异构体的是（）
A. CH3CH2CH2CH3
B. CH3CH＝CHCH3
CH3CH2CH(OH)CH3
D. CH3CH2CH2CHO
下列说法正确的是（）
A. 手性分子一定具有旋光性
B. 含有手性碳原子的化合物一定具有旋光性
C. 内消旋体是一对对映体的等量混合物
D. 构型为（2R，3S）的化合物一定是内消旋体
关于偏振光的理解正确的是（）
A. 发生偏移的光
B. 发生振动的光
C. 发生偏移振动的光
D. 只在一个平面内振动的光
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