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單項選擇題

A.Pneumatic pipes
B.Hydraulic pipes
C.Telescopic pipes
D.Operating gas pipes

你可能感興趣的試題

A.The ballast system
B.The salt water system
C.The bilge system
D.The domestic system

A.A relief valve
B.An alarm
C.A pressure gauge
D.A non-maim valve

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