A.0.5% B.1% C.1.5% D.2%
A.工質(zhì) B.機(jī)組熱力系統(tǒng) C.熱力設(shè)備 D.汽水系統(tǒng)
A.普低鋼 B.高碳鋼 C.合金鋼 D.低碳鋼