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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 useAccording 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

试题出自试卷《轮机部三管轮考试模拟题7(轮机英语)》

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