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20.Which type of boiler depends on the heat input to establish differential densities between the steam-and-water mixture flowing in the riser or generating circuits and the water flowing downward in the downcomer circuits?
(A)Once-through
(B)Natural-circulation
(C)Forced-circulation
(D)Two-furnace, forced circulation superheat



20.Which type of boiler depends on the h..-阿摩線上測驗