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?（）AOil vapour in air piping are dangerousBExplosion will cause oil vapouring in air linesCOil vapour in air piping should be drainedDOil in air piping should not be drained
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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