【多选题】下列说法中不正确的是 ( )
A.
s 键的一对成键电子的电子密度分布对键轴方向呈园柱型对称 ;
B.
p 键电子云分布是对通过键轴的平面呈镜面对称
C.
s 键比 p 键活泼性高 , 易参与化学反应
【判断题】s 键比 p 键活泼性高,易参与化学反应。
【简答题】A.He has trouble stopping. B.There are too many rocks. C.Going uphill is difficult. D.There are too many curves.
【判断题】p 键比 s 键活泼性高,易参与化学反应
【单选题】The writer believes that because of the increasing use of interviews
A.
there are too many current affairs programs
B.
standards in broadcasting have declined
C.
the cost of broadcasting has increased
D.
Roadcasters have become less popular
【简答题】A.There are too many complaints from net users. B.Hackers' attack of MySpace cannot be forbidden. C.Parents cannot help checking children's information. D.It is easy for trouble-makers to do harm to c...