单项选择题
A.good lubrication B.low thermal stress C.good mechanical properties D.acid corrosion
Compressed air is used on board ship （）.A.for starting ...
单项选择题Compressed air is used on board ship （）.
A.for starting diesel engines B.in pneumatic control system C.in pneumatic tools D.All the above are true
Compressed air is supplied by air compression to （）.A.t...
单项选择题Compressed air is supplied by air compression to （）.
A.the air receivers B.the starting valves C.the cylinder covers D.the distributors
Charging-air pressure increases if there is incorrect c...
单项选择题Charging-air pressure increases if there is incorrect combustion and drop in the （） of the diesel engine.
A.machine efficiency B.machinery efficiency C.mechanical efficiency D.mechanics efficiency
