阿摩線上測驗
32. The Controllable Pitch propeller eliminates the need for a direct-reversing engine while the gearing allows a suitable __________ to be selected.
(A)propeller blade
(B)propeller pitch
(C)propeller speed
(D)propeller boss
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統計： A(1), B(2), C(1), D(0), E(0) #3478210
統計： A(1), B(2), C(1), D(0), E(0) #3478210
