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With reference to a rotary vane steering gear system, which one of the following statements is true?（）
A:The three moving vanes and the three fixed vanes form three pressure chambers
B:The three moving vanes and the three fixed vanes form six pressure chambers
C:The three moving vanes and the three fixed vanes form nine pressure chambers
D:The three moving vanes and the three fixed vanes form twelve pressure chambers

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出自：海船船员证

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