One of the differences between a two-strok
题型：单项选择题
问题：
One of the differences between a two-stroke engine and a four-stroke engine is,（）
A.a two-stroke engine can’t work without cylinders
B.a two-stroke engine can’t work without pistons
C.a two-stroke engine can’t work without crankshafts
D.a two-stroke engine can’t work without a blower