题目内容

Most pistons have three rings: ________.

A. two oil rings and one compression ring
B. three compression rings
C. two compression rings and one oil ring
D. three oil rings

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________ transform the energy of the expanding gases into mechanical energy.

A. Piston rings
B. Connecting rods
C. Pistons
D. Valves

Crankshaft is held in ________.

A. oil pan
B. combustion chamber
C. cylinder head
D. cylinder block

When the piston moves up with both intake and exhaust valves closed, we call it ________.

A. intake stroke
B. compression stroke
C. power stroke
D. exhaust stroke

In the gasoline engine, ________ are compressed in the cylinder in the compression stroke.

A. gasoline
B. diesel
C. air
D. fuel-air mixture