A.肺活量 B.肺活量絕對(duì)值 C.肺活量/體重指數(shù) D.胸圍/身高×100指數(shù)
A.主動(dòng)脈瓣 B.二尖瓣 C.三尖瓣 D.肺動(dòng)脈瓣
A.20-30% B.30-40% C.40-50% D.50-60%