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问题 选择题

       中国人民解放军驻香港部队于________年7月1日零时在威尔士亲王军营举行了升旗仪式，这是中国恢复对香港行使主权的重要标志。 [ ]

A．1949

B．1984

C．1997

D．1999

答案

答案：C

单项选择题

模似机C、T在放疗定位中的作用（）

A、可做靶区与器官重建、有效扫描野比CT机大、方便2D计划设计

B、可做3D图像重建、有扫描秒比CT机大、方面2D计划设计

C、可做3D图像重建、有扫描秒比CT机小、方面2D计划设计

D、可重速DRR图像、有扫描秒比CT机大、方面2D计划设计

E、不能做3D图像重建、有扫描秒比CT机大、方面2D计划设计
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单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

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 (71) between sending the notification and notification arriving at the source, thousands of additional (72) may arrive. In ATM network, a major tool for preventing (73) is (74) control. When a host wants a new virtual (75) , it must describe the traffic to be offered and the service expected.

72（）

A．packets

B．cells

C．message

D．files
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