单项选择题
A.the start fails B.the fuel pumps will be put into operation C.the fuel valves are damaged D.the combustion process will take over
The engine may lose power or slow down during running, ...
单项选择题The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.
A.crack B.knocking C.leaking D.seizure
The engine is started with （） supplied from air receive...
单项选择题The engine is started with （） supplied from air receivers.
A.pressure oil B.pressure water C.compressed air D.cooling water
The engine is reversed by axial displacement of the cam...
单项选择题The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.
A.lathed B.shaped C.shrunk D.developed
