题目内容
（请给出正确答案）
[主观题]
The transmission system transmitting power from the engine to the propeller is composed of shafts, bearings, and_____ .
A.propeller
B.flying wheel
C.main engine
D.crankshaft
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A.mechanical energy to kinetic energy to potential energy
B.mechanical energy to potential energy to kinetic energy
C.potential energy to mechanical energy to kinetic energy
D.kinetic energy to mechanical energy to potential energy
