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问题 单项选择题

免疫增殖病不包括下列哪种疾病

A．慢性淋巴细胞性白血病
B．淀粉样变性
C．原发性巨球蛋白血症
D．慢性淋病肉芽肿
E．多发性骨髓瘤

答案

参考答案：D

解析：慢性淋病肉芽肿属于源发性吞噬细胞缺陷病。

选择题

铅蓄电池中的总反应为Pb+PbO2+2H2SO4 2PbSO4+2H2O，下列说法正确的是

A．在放电时，正极发生的反应是 Pb(s) +SO42－（aq）= PbSO4(s) +2e－

B．在放电时，电池的负极材料是铅板

C．在充电时，电池中硫酸的浓度不断变小

D．在充电时，阳极发生的反应是 PbSO4(s)+2e－=" Pb(s)+" SO42－（aq）
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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．computers
B．routers
C．switches
D．networks
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