A.凝汽器銅管結(jié)垢 B.凝汽器銅管泄漏 C.凝結(jié)水過冷卻 D.高混床退出運(yùn)行
A.20號(hào)鋼 B.15CrMo C.12Gr1MoV D.2Cr12WMoNbVB
A.30 B.50 C.100 D.120