A.1.2MPa火災(zāi)報(bào)警信號(hào) B.1.2MPa壓力開關(guān) C.0.4MPa火災(zāi)報(bào)警信號(hào) D.0.4MPa壓力開關(guān)
A.2 B.2.5 C.5 D.10
A.100%B.80%C.65%D.50%