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问题 单项选择题

患者男性，50岁，排尿过程中突然尿流中断，疼痛剧烈，改变体位后又可排尿，应考虑

A．肾结石

B．输尿管结石

C．膀胱结石

D．后 * * 结石

E．前 * * 结石

答案

参考答案：C

解答题

计算：（1）-4+2×|-3|-（-5）；

（2）-3×（-4）+（-2）3÷（-2）2-（-1）101．
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单项选择题

One of the most widely used routing protocols in IP networks is the Routing Information Protocol(RIP)．RIP is the canonical example of a routing protocol built on the (71) algorithm．Routing protocols in internetworks differ slightly from the idealized graph model．In aninternetwork，the goal of the routers to forward packets to various (72) ．
Routers running RIP send their advertisement about cost every (73) seconds．A router also sends an update message whenever an update from another router causes it to change itsrouting table．
It is possible to use a range of different metrics or costs for the links in a routing protocol．RIP takes the simplest approach，with all link costs being equal (74) Thus it always tries tofind the minimum hop route．Valid distances are 1 through (75) ．This also limits RIP torunning on fairly small networks．

A．1
B．15
C．16
D．length of the link
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