“工作面作业时，不执行敲帮问顶制度”属（）行为。
A、一般“三违”
B、轻微“三违”
C、严重“三违”
参考答案：C
- --How often does your sister use the Internet? ---About _________.
A．three time
B．three times
C．three time every day
D．three times a day
