单项选择题
A.twice as large as with a cast iron piston
B.the same size as with a cast iron piston
C.half as large as with a cast iron piston
D.the same size as the crown of an aluminum piston
单项选择题 Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）
单项选择题 If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）
单项选择题 Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to（）