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單項(xiàng)選擇題

With reference to rules governing steering gear, which one of the following rules is incorrect? ()

A.It is required that all ships are provided with two independent steering gear systems that is one main and one auxiliary
B.The auxiliary gear could be power operated in passenger ships
C.The auxiliary gear must be of adequate strength and sufficient to steer a ship at navigable speed
D.All moving parts of the steering gear must be guarded against any possible damage

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