单选题By which of the following means is force efficiently provided to vary the pitch of the blades on a modem controllable pitch propeller?（）AHydraulicBMechanicalCPneumaticDElectrical
单选题
By which of the following means is force efficiently provided to vary the pitch of the blades on a modem controllable pitch propeller?（）
A
Hydraulic
B
Mechanical
C
Pneumatic
D
Electrical
参考解析
解析：
暂无解析
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