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81.螺旋桨调速器是通过螺旋桨轮毂上的螺距改变机构,通过增加或减少螺旋桨的螺距来调节发动机或螺旋桨转速的装置。( )

A
 Propeller governor is a device that adjusts the speed of the engine or propeller by increasing or decreasing the clearance of the propeller through the clearance changing mechanism on the propeller hub.
B
 Propeller governor is the device that regulates the rpm of the engine or propeller by increasing or decreasing the propeller pitch, through a pitch change mechanism in the propeller hub.
C
 Propeller governor is through the propeller hub of the propeller pitch changing machine , adjusts the speed of the propeller or engine by increasing or decreasing the propeller gap.

答案解析

正确答案:B
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