單項(xiàng)選擇題
A.50%~99% B.50%~70% C.50%~90% D.70%~99% E.60%~80%
A.2倍 B.4倍 C.6倍 D.8倍 E.5倍
A.<6.5% B.<7% C.<7.2% D.<7.5% E.<8%