27. The __________ eliminates the need for a direct-reversing engine while the gearing allows a suitable propeller speed to be selected.
(A)Controllable Pitch Propeller
(B)Fixed Pitch Propeller
(C)VSP Propeller
(D)Jet Propeller

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統計： A(9), B(2), C(0), D(0), E(0) #3479521

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