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单选题
Propeller Governor is the device that regulates the rpm of the engine/propeller by increasing or decreasing the propeller pitch, through a pitch change mechanism in the propeller hub.
A
“螺旋桨调速器”是利用螺旋桨轮毂内变距机构，通过增大或减小螺旋桨桨距来调节发动机或螺旋桨转速的装置。
B
“螺旋桨调速器”是通过螺旋桨的螺距变化机构，通过增加螺旋桨螺距来调节发动机或螺旋桨转速的装置。
C
“螺旋桨调速器”是通过螺旋桨的螺距变化机制，通过减少螺旋桨桨距来调节发动机或螺旋桨转速的装置。
答案解析
正确答案：A
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