单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
Maximum and minimum working temperatures must be considered when choosing the joint, which must be so installed that it is neither over-compressed nor over-extendedThe bold and italic word "which "probably means （）.
A.maximum working temperature
B.minimum working temperature
C.the joint
D.the insulating material -
单项选择题
Stainless steel is material commonly used for temperatures up to 50℃; beyond that and for severe corrosive conditions other materials are requiredThe bold and italic word “that” probably means （）.
A.stainless steel
B.temperature
C.50℃
D.other materials
