海因里希法则是一个统计结论。330起同种违章作业行为致人严重伤害的有（）.
A. 1次
B. 10次
C. 30次
D. 5次
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Disastrous explosions have been caused by accumulations of oil or oil vapour in air lines not drainedAccording to the above sentence, which of the following statements is true?（）
A. Oil vapour in air piping are dangerous
B. Explosion will cause oil vapouring in air lines
C. Oil vapour in air piping should be drained
D. Oil in air piping should not be drained
胆石利通片来源于（）
A. 本草纲目
B. 金匮要略
C. 黄帝内经
D. 伤寒论
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