单项选择题
A: Please tell me the specifications and quantity. B: （）
A.Pump diesel oil first B.300 tons of 180 cst fuel oil C.The figure is all right D.OK, I’ll sign it
A variable pitch propeller is made （） a boss with separ...
单项选择题A variable pitch propeller is made （） a boss with separate blades mounted into it.
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
