[单选题]
杨冰,12岁,拟需直接输血100ml,需准备枸橼酸钠生理盐水的浓度和量分别为
A.4%,10ml
B.10%,20ml
C.15%,25ml
D.4%,30ml
E.10%,40ml
参考答案与解析: