相对于非关系模型,关系数据模型的缺点之一就是( )。
A.数据独立性高 B.存取路径对用户透明,需进行查询优化C.数据结构简单 D.有严格的数学基础
参考答案:B
根据《国家突发公共卫生事件医疗卫生救援应急预案》,下列转送伤员描述错误的一项是()
A、对已经检伤分类待送的伤病员进行复检。对有活动性大出血或转运途中有生命危险的急危重症者,应就地先予抢救、治疗,做必要的处理后再进行监护下转运。
B、医疗机构若无相应能力治疗伤员、病员,可以拒诊、拒收伤病员。
C、在转运中,医护人员必须在医疗仓内密切观察伤病员病情变化,并确保治疗持续进行。
D、认真填写转运卡提交接纳的医疗机构,并报现场医疗卫生救援指挥部汇总。
SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame Relay or X.25.An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.
(73)是()
A. a primary station
B. one or more primary stations
C. a secondary station
D. one or more secondary stations