單項選擇題根據(jù)臨床用血需求量,發(fā)達國家獻血量達到以下何比例時能夠滿足臨床需求()
A.2%~3%
B.2.5%~3.5%
C.3%~4%
D.3.5%~4.5%
E.4%~5%
A.2%~3%
B.2.5%~3.5%
C.3%~4%
D.3.5%~4.5%
E.4%~5%