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Which of the following statements concerning the water tube and fire tube boilers is not true?（）
A:natural circulation of the water in the water tube boiler is better than that in the fire tube boiler
B:for the same output the water tube boiler will carry less mass of water compared with the fire tube boiler
C:the water tube boiler will cost shorter time for steam raising
D:the water tube boiler require lower skill in operating and maintaining

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出自：海船船员证

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