To（）sanitary water from any vessel，an application shall be made to Harbor Authorities for approval.

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  A . high steam pressure in the boiler B . abnormally high feed water temperature C . abnormally high boiler water temperature D . steam demand exceeding feed pump capacity

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  A . scale B . sludge C . chemicals D . air

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  A . to decrease scale formation B . for better cooling effect C . for more economical purpose D . to raise vacuum

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  A . discharging B . recircling C . loading D . taking i

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