30. What is not involved for the development of ship propulsion system?
(A) Propeller
(B) Deck machine
(C) Main shafting system
(D) Selection of propulsive engine
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統計: A(46), B(274), C(41), D(37), E(0) #3351382
統計: A(46), B(274), C(41), D(37), E(0) #3351382