中国证监会收到申请文件后，在( )个工作日内作出是否受理的决定。 A．2 B．3

_____ by the terrible earthquake, Wenchuan, a city in Sichuan province, was _____ from the outside. [ ]

A. Having struck; cut up

B. Struck; cut down

C. Having struck; cut out

D. Struck; cut off

I usually do my homework after dinner until 10 pm, ______ is my bedtime.

A．who

B．what

C．which

D．that

在所有排序方法中，关键字比较的次数与记录的初始排列次序无关的是( )。

A．希尔排序

B．冒泡排序

C．插入排序

D．选择排序

为了提高气缸的充气效率，多数发动机进气门直径比排气门的直径（）

铁路行车事故分为哪几种？