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单选题
The piston moves up and down, thus causing the rotational movement of the（）
A
crankshaft
B
connecting rod
C
cross-head
D
main beating
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考题
单选题The piston moves up and down, thus causing the rotational movement of the（）A
crankshaftB
connecting rodC
cross-headD
main beating
考题
单选题The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.A
the same pistonB
the piston nearbyC
the other pistonsD
the generators on board
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单选题In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）A
the inlet port is opened by the up coming piston； the port is closed by the down goingB
the inlet valve is opened by the down going piston；the inlet valve is closedC
the inlet port is opened by the down going piston；the port is closed by the up comingD
the inlet valve is opened
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单选题In a four-stroke engines the camshaft rotates at （）.A
half the engine rotational speedB
twice the engine rotational speedC
the engine rotational speedD
four times the engine rotational speed
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