單項(xiàng)選擇題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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1.單項(xiàng)選擇題In usual marine applications, bellows joints are designed and fitted to accommodate straight line axial movement only and the associated piping requires adequate anchors and guides to prevent misalignmentAccording to the above sentence, which of the following statements is true?（）

A.The marine bellows joints are attached in the accommodation only
B.The bellows joints should be attached to anchors
C.The associated piping should be thrown into the water like as anchors
D.The connecting piping with the joints should be fixed firmly

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