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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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出自：海船船员证

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