单项选择题

A.抽1ml肝素钠,0.9%生理盐水稀释到10ml,静推4ml
B.抽1ml肝素钠,0.9%生理盐水稀释到20ml,静推4ml
C.抽2ml肝素钠,0.9%生理盐水稀释到10ml,静推4ml
D.抽1ml肝素钠,0.9%生理盐水稀释到10ml,静推2ml
E.抽2ml肝素钠,0.9%生理盐水稀释到10ml,静推2ml