4分)同系物是指: 相似,在分子组成上相差 原子团的化合物。
结构 一个或若干个CH2
同系物是指:结构相似,在分子组成上相差一个或若干个CH2原子团的化合物。
Those who ____ in ____ compositions, please hand them in this afternoon. [ ]
A. hasn't handed; his
B. haven't handed; their
C. has handed; their
D. have handed; his
提出道德认知发展阶段理论的是( )。
A.维果斯基
B.皮亚杰
C.科尔伯格
D.加德纳