问题：
[单选] （） rods are not in proper condition so that too much fuel is supplied to the corresponding cylinder.
Piston。Sounding。Regulating。Connecting。
问题：
[单选] （） allows for expansion and water make up in the water cooling system.
A top tank。A head tank。A head valve。A drain tank。
问题：
[单选] （） at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.
A relief valve。An alarm。A pressure gauge。A non-maim valve。
问题：
[单选] （） is used for washing and drinking.
The ballast system。The salt water system。The bilge system。The domestic system。
问题：
[单选] （） provide the water to the pistons.
Pneumatic pipes。Hydraulic pipes。Telescopic pipes。Operating gas pipe。
问题：
[单选] （） are formed by abrasive particles entering the bearing and scoring the shaft.
Grooves。Recesses。Ridges。Ni。
问题：
[单选] （） are mounted on and bolted to the bed-plate cross girders.
The crankshaft。The crankcase。The guide-ways。The frame。
问题：
[单选] （） is fully floating in both connecting rod small end and the piston skirt.
The piston rod。The cross head pin。The gudgeon pin。The crank-pi。
问题：
[单选] （） is made of a boss with separated blades mounted into it.
A variable pitch propeller。A variable pitch nut。A fixed pitch parallel。A fixed pitch screw。
问题：
[单选] （） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
An air receiver。An operating valve。An automatic valve。An air distributor。
