题目内容

旅游业的三大支柱是旅行社业、（）和旅游交通业。

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在标准状况下（0℃，760mmHg）下，设吸入气体总量为V₁，FiQ₁，FEQ₂分别为吸入，呼出气体中Q₂浓度的百分数。FiCQ₂，FEQ₂分别为吸入，呼出气体中CO₂浓度的百分比。求耗氧量？

Emerson（）Transcendentalist.

A. called himself
B. did not like the term
C. never called himself
D. created the term

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On what kinds of networks does OSPF elect a backup designated router?（）

A. Point-to-point
B. Point to multipoint
C. Broadcast
D. Non-broadcast multi-acce