单项选择题
A.of B.up of C.from D.out
A single piece（） fitted with bronze rings guides the pi...
单项选择题A single piece（） fitted with bronze rings guides the piston in the cylinder liner.
A.piston skirt B.piston crown C.guide way D.cross-head
A separate piston cooling system is used to limit any c...
单项选择题A separate piston cooling system is used to limit any contamination （） piston cooling glands（） the piston cooling system only.
A.between；to B.either；or C.from；to D.neither；nor
A separate piston cooling system is used （） any contami...
单项选择题A separate piston cooling system is used （） any contamination from piston cooling glands to the piston cooling system only.
A.to help B.to limit C.to protect D.to remove
