单项选择题
A.cylinders B.exhaust valves C.pistons D.fuel valves
Diesel engines are started by supplying （） into the cyl...
单项选择题Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.
A.fuel oil B.diesel oil C.compressed air D.jacket water
A.cooling water B.compressing air C.compressed air D.cylinder oil
Cylinders of marine diesel engines are normally cooled ...
单项选择题Cylinders of marine diesel engines are normally cooled by （）.
A.sea water B.fine mineral oil C.sanitary water D.fresh water
