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单选题
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
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更多 “单选题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 dangerousB Explosion will cause oil vapouring in air linesC Oil vapour in air piping should be drainedD Oil in air piping should not be drained” 相关考题
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单选题A
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Rescue efforts were stopped on Thursday.D
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