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單項(xiàng)選擇題

Constant cooling the various components of diesel engine has a number of functions except for （）.

A.good lubrication
B.low thermal stress
C.good mechanical properties
D.acid corrosion

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

Compressed air is supplied by air compression to （）.

A.the air receivers
B.the starting valves
C.the cylinder covers
D.the distributors

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