单项选择题
There should be a lubricating oil （） between the main beatings and the crankshaft.
A.film
B.cap
C.lacquer
D.shell
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相关考题
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There is an injection pump for each cylinder, which is usually operated once every cycle by （） on the camshaft.
A.a gear
B.a cam
C.a rod
D.a miler -
单项选择题
There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.
A.recirculating
B.total loss
C.cooling
D.refrigeration -
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There is （） in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.
A.a setting tank
B.a service tank
C.a head tank
D.an expansion joint
