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问题 单项选择题 A3/A4型题

患者，男，4岁半，全牙列反，父亲是反面型。上前牙唇倾度正常，下前牙直立，反覆盖5mm，反覆浅。

该患者的治疗时间可能为（）

A.2～3个月

B.4～6个月

C.8～10个月

D.12个月

E.15个月

答案

参考答案：E

单项选择题

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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填空题

泪膜分三层：（ ）、（ ）、（ ）。
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