[单选题]

保留灌肠的患者,灌肠液量不宜超过多少ml?液面至肛门的高度应低于多少厘米?()

A.200ml,30cm

B.200ml,40cm

C.300ml,30cm

D.300ml,40cm

E.以上均不对

参考答案与解析: