The two most common types of engines used in helicopters are the reciprocating engine and the turbine engine.
A 直升机最常用的两类发动机是星型发动机和涡轮发动机。
B螺旋桨飞机最常用的两类发动机是往复式发动机和涡喷发动机 。
C直升机最常用的两类发动机是活塞发动机和涡轮发动机。
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