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问题 单项选择题

患儿男，1岁。未接种过卡介苗，其父近期患开放性肺结核，家长要求给小儿做结核菌素试验。PPD试验阳性。使用异烟肼对该患儿进行预防性化疗，疗程应为（）

A.1～2个月

B.2～3个月

C.3～6个月

D.6～9个月

E.9～12个月

答案

参考答案：D

补全对话，情景问答
根据图示完成句子，每空一词。
1. It's ______ in spring．
    We _____________ in spring．
2. It's ______ in summer.
    We ____________ in summer.
3. It's ______ in autumn.
    We ____________ in autumn.
4. It's ______ in winter.
    We ____________ in winter.
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单项选择题

Routing protocols use different techniques for assigning (37) to individual networks. Further, each routing protocol forms a metric aggregation in a different way. Most routing protocols can use multiple paths if the paths have an equal (38) Some routing protocols can even use multiple paths when paths have an unequal cost. In either case, load (39) can improve overall allocation of network bandwidth. When multiple paths are used, there are several ways to distribute the packets. The two most common mechanisms are per-packet load balancing and per-destination load balancing. Per-packet load balancing distributes the (40) across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on (41)

37（）

A.calls 

B.metrics 

C.links 

D.destinations
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