氯元素的原子结构示意图为如下，下列说法中，错误的是 [ ] A．氯原子带有7个单

Mary often goes to school by bus but _______ her father drives her to school. [ ]

A. sometimes

B. some times

C. sometime

D. some time

当我们的人身自由权和生命健康权受到侵害时，我们应采取哪些有效的措施？

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

（2012•江西）用灯帽盖灭酒精灯的灭火原理是（　　）

装配式梁桥构件划分应遵守哪些规则？