单项选择题

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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单项选择题

A.for starting diesel engines
B.in pneumatic control system
C.in pneumatic tools
D.All the above are true

单项选择题

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

单项选择题

A.machine efficiency
B.machinery efficiency
C.mechanical efficiency
D.mechanics efficiency