单项选择题
It is usual to identify the fluids in pipes by bands of paint at intervals, and the engineer should familiarize himself with the code in use.According to the above sentence, which of the following statements is true?（）
A.People can know the types of fluids in pipes by feeling with hands
B.There are series of rings painted in the pipes to show various fluids
C.Engineers should wear cards standing for ranks
D.Engineer knows his own code very well
相关考题
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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 -
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
