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單項(xiàng)選擇題

A variable pitch propeller is made （） a boss with separate blades mounted into it.

A.of
B.up of
C.from
D.out

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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