单纯性小肠梗阻的X线征象表现为（）
A.假肿瘤征
B.空、回肠换位
C.短小液平面
D.较长液平面
E.连贯、规则、紧靠扩张的肠曲
参考答案：C, D, E
属于容积性泻药的是（）
A.硫酸镁
B.乳果糖
C.番泻叶
D.开塞露
E.聚乙二醇4000
Open Shortest Path First (OSPF) is a (66) routing algorithm that (67) work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (68) processing power. The (69) algorithm is used to calculate routes. OSPF routing table updates only take place when necessary, (70) at regular intervals.
A．more
B．less
C．same
D．most
