單項(xiàng)選擇題() are formed by abrasive particles entering the bearing and scoring the shaft.

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


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1.單項(xiàng)選擇題() are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.

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

2.單項(xiàng)選擇題() provide the water to the pistons.

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

3.單項(xiàng)選擇題() is used for washing and drinking.

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

4.單項(xiàng)選擇題() at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.

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

5.單項(xiàng)選擇題() allows for expansion and water make up in the water cooling system.

A.A top tank
B.A head tank
C.A head valve
D.A drain tank