单项选择题
How are the pressure and temperature affected in a diesel engine cylinder during compression?（）
A.Pressure and temperature decrease B.Pressure and temperature increase C.Pressure decreases and temperature increases D.Pressure increases and temperature decreases
单项选择题 A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）
单项选择题 The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）
单项选择题 Turbulence is created in the cylinders of a diesel engine to （）
