A.90 B.180 C.360 D.540
A.0.5 B.0.7 C.1 D.1.2
A.3 B.6 C.12 D.15
A.5s B.10s C.20s D.30s
A．防止回流装置 B．减压装置 C．压差自动调节装置 D．防火阀
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