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单选题
Propeller system includes the complete mechanical or electrical propeller, pumps, motors, governor, alternators, and those units and components external to or integral with the engine used to control the propeller blade angel.
A
螺旋桨系统包括完整的机械或电气驱动螺旋桨、泵、马达、调速器、交流发电机，以及用于控制桨叶角的发动机外部或与发动机一体的组件和部件。
B
螺旋桨系统包括完整的机械或电动螺旋桨、泵、马达、调速器、交流发电机是用来控制桨叶角的发动机外部或整体的组件和部件。
C
螺旋桨系统包括完整的机械或电动螺旋桨、泵、马达、调速器、交流发电机和那些组件和部件，都位于发动机外部，或者与发动机是一个整体，用于控制桨叶角。
答案解析
正确答案：A
相关知识点：
螺旋桨系统控制全掌握
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