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【单选题】
化合物 C 3 H 5 Cl 3 , 1 H NMR 谱图上有 3 组峰,其结构式是A.
CH 3 -CH 2 -CCl 3
B.
CH 3 -CCl 2 -CH 2 Cl
C.
CH 2 Cl-CH 2 -CH 2 Cl
D.
CH 2 Cl-CH 2 -CHCl 2
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举一反三
【多选题】How do American parents rear their children?
A.
They are not strict with their children on things like discipline
B.
They ask their children to do some housework
C.
They think building self-esteem is important for children
D.
They want to keep their children happy
【多选题】How do American parents rear their children?
A.
They are not strict with their children on things like discipline
B.
They ask their children to do some housework
C.
They think building self-esteem is important for children
D.
They want to keep their children happy
【简答题】How long do children usually stay at university in the man’s country?
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