[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: