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单选题
螺旋桨指完整的机械或电动螺旋桨、泵、马达、交流发电机，以及用于控制桨叶角的发动机部件。
A
Propeller refers to the complete mechanical or electrical propeller, pumps, motors, alternators, and those engine components used to control the propeller blades pitch.
B
Propeller refers to the complete mechanical or electrical propeller, pumps, motors, generators, and those engine components used to control the propeller blade angel.
C
Propeller refers to the complete mechanical or electrical propeller, pumps, motors, alternators, and those engine components used to control the propeller blade angel.
答案解析
正确答案：C
