A.系統(tǒng)安裝后 B.系統(tǒng)試壓前 C.系統(tǒng)安裝、試壓、絕熱后 D.系統(tǒng)安裝試壓后
A.0.70DN B.0.80DN C.0.85DN D.0.75DN
A.1% B.10% C.5% D.15%