下列化合物分子,在核磁共振氢谱图中能给出三种信号峰的是 [ ]
A.CH3CH2CH3
B.
C.CH3-O-CH3
D.
答案:B
The government plans to bring in new laws _____ parents to take more responsibility for the education of their children.
A.forced
B.forcing
C.to be forced
D.having forced
“府院之争”的激化,从根本上反映了
A.国会内各派政客之间的权利
B.南方军阀之间的地盘之争
C.是否要参加第一次世界大战
D.美国、日本争夺对华控制权