单项选择题

（） are formed by abrasive particles entering the bearing and scoring the shaft.

A.Grooves
B.Recesses
C.Ridges
D.Nips

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单项选择题

A.Diffusers
B.Compressors
C.Steam boilers
D.Soot blowers

单项选择题

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

单项选择题

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