患者，女，60岁，因肺心病收住院治疗，护士巡视病房时，发现病人口唇发绀，血气分析结果显示：PaO2 5．6 kPa，PaCO2 9． 3kPa。根据病人症状及血气分析，为病人提供的用氧方式为
A.低流量，高浓度持续给氧
B.低浓度，高浓度持续给氧
C.低流量，低浓度持续给氧，
D.低流量，低浓度间断给氧
E.高流量，高浓度间断给氧

单项选择题Coherent light of a single frequency passes through a double slit with a separation d, to produce a pattern on a screen as distance D from the slits. What would cause the separation between adjacent minima on the screen to increase?( )

单项选择题病人，男性，42岁，因胃十二指肠溃疡出血行胃大部切除术，术后早期最适当的营养液输注途径是