By which of the following means is force efficiently provided to vary the pitch of the blades on a modem controllable pitch propeller?（）<br>A:Hydraulic<br>B:Mechanical<br>C:Pneumatic<br>D:Electrical

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

出自：海船船员证

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