問題詳情
20.Which type of boiler depends on the heat input to establish differential densities between thesteam-and-water mixture flowing in the riser or generating circuits and the water flowing downwardin the downcomer circuits?
(A)Once-through
(B)Natural-circulation
(C)Forced-circulation
(D)Two-furnace, forced circulation superheat
參考答案
答案：B
難度：適中0.627273
統計：A(10),B(69),C(12),D(11),E(0)