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请看下面材料当前我国经济发展和现代化建设中碰到的最大问题是经济结构不合理。因此，要实现国民经济健康持续协调发展，全面建设小康社会，必须对经济结构进行战略性调整。结合马克思的社会总资本再生产理论，分析论述对经济结构进行战略性调整的必要性和意义。

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动脉导管未闭( )

A. X线胸片显示右房、右室大，肺野充血，肺动脉段突出，主动脉结较小
B. X线胸片显示右房、右室大，肺野清晰，肺动脉段突出，主动脉结正常
C. X线胸片显示右房、右室大，肺野清晰，肺动脉段凹陷，主动脉结增大
D. X线胸片显示左房、左室大，肺野充血，肺动脉段突出，主动脉结增大
E. X线胸片显示左房、左室大，肺野充血，肺动脉段突出，主动脉结较小

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简述通货紧缩的含义。

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To a router, a flow is a (1) of packets that share the same Characterstics, such as traveling the same (2) ,using the same (3) ,having the same kind of security, and so on. A router that supports the handling of flow labels has a (4) table. The table has an entry for each active flow label; each entry defines the (5) required by the corresponding flow label. 4（）

A. flow table
B. flow label
C. rout table
D. Tag table

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In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) ,it must describe the traffic to be offered and the service expected. 2（）

A. packets
B. cells
C. message
D. files

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