单项选择题
Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.
A.cooling water B.compressing air C.compressed air D.cylinder oil
单项选择题 Cylinders of marine diesel engines are normally cooled by （）.
单项选择题 Cylinder liner cooling is often referred to as （）.
单项选择题 Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.
