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多项选择题

WWW服务器的功能包括( )。

A.核心功能
B.网站管理
C.应用构造
D.动态内容
E.电子商务
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相关考题

未知题型
Wildlife refuges mainly serve as havens for millions of ducks, geese and other migratory birds. And this is what most people come to seE.Much of the fun is in knowing and distinguishing the many kinds that are present in great variety. The activities and antics of the bird world are fascinating to anyone taking the time to observe up closE.A camera, likewise, will record some of the unusual sights that will be seen.
Most of the areas are staffed by biologists--individuals who have a great interest in the out doors. They are all enthusiastic naturalists who can help a person to a richer enjoyment of the world of naturE.A stop at the refuge headquarters will yield ideas on what to see and where, as well as helpful literaturE.A few refuges have visitor centers where displays tell the story of the refuge and where there are movies or color slide shows of the area and its wildlifE.
Hunting on a refuge seems inconsistent with its purpose of protecting and saving. However, big game, if allowed to increase to an excessive degree, can be their own worst enemy. They overbrowse their rangE.Then starvation ruins the herD.But even before nature balances animals to food supply, the destruction of trees and shrubs removes food and cover essential to many smaller animals as well. It' s good management of the game, and to the sportsman' s benefit, to crop big game judiciously.
未知题型
两企业排污控制的边际成本分别为MC1=0.6q1，MC2=0.3q2。排污量一ppm转换系数分别为a1=1.0，a2=0.5。若不进行控制，两企业的排污量分别为25吨和30吨，周围环境的标准为21ppm。排污费定为6元/ppm是否合理?
单项选择题
以下哪项不是提高动力装置有效热效率的途径。（ ）
A．提高动力装置推进效率
B．提高动力装置热效率
C．改进船舶操纵，实行经济航行
D．改善动力装置运行环境
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