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问题 单项选择题 A2型题

27岁男性。入院前一小时右腕上6cm处被机器绞断，软组织挫伤严重，神经、血管均较骨骼短缩2cm，该患者最好的治疗方案，是（）

A.清创后，残端缝合

B.清创后，残端缝合，断肢保存，待二期再植

C.包扎换药

D.立即行断肢再植术

E.清创后，做前臂分叉成形术

答案

参考答案：D

单项选择题

The network layer provides services to the transport layer．It can be based on either (71) ．In both cases，its main job is (72) packets from the source to the destination．

In network layer，subnets can easily become congested，increasing the delay and (73) .

for packets．Network designers attempt to avoid congestion by proper design．Techniques include (74) policy，caching，flowcontrol，and more．

The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service．The methods that can be used for this include buffering at the client，traffic shaping，resource (75) ，and admission control．Approaches that have been designed for good quality of service include integrated services(including RSVP) ，differentiated services， and MPLS．

（71）处填（）。

A．virtual circuits or datagrams

B．TCP or UDP

C．TCP or IP

D．IP or ARP
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单项选择题

下列制动器中稳定性最佳的制动器是（）。

A.领从蹄式制动器

B.钳盘式制动器

C.自增力式制动器
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