A.12~13 B.20 C.25 D.30
A.選擇城市燃?xì)廨斉涔芫W(wǎng)的壓力級制 B.確定燃?xì)廨斉湓O(shè)施的保護要求 C.規(guī)劃布局燃?xì)廨斉涔芫W(wǎng) D.預(yù)測城市燃?xì)庳?fù)荷
A.5.0 B.6.0 C.7.0 D.8.0