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【单选题】
病人张某60岁在输液过程中突然出现呼吸困难,气促,咳嗽。咳泡沫血痰等症状,用20%到30%乙醇湿化吸氧,作用是:A.
增加迷走神经兴奋
B.
增加外阻力
C.
降低肺泡内泡沫表面张力
D.
降低泡沫表面张力
E.
降低吸入气体的细菌密度
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举一反三
【单选题】经常可以听说到多媒体,那么多媒体技术的基本特征是( )
A.
有处理文字、音频和视频的能力,表现能力强
B.
使用计算机、光盘驱动器作为处理的主要工具
C.
多样性、交互性、集成性和实时性
D.
多媒体系统是对文字、图形、声音等信息及资源进行管理的系统
【单选题】Why did the resistance of insects to man-made insecticides develop so rapidly?
A.
Insects can develop ways of dealing with man-made insecticides as they do with natural poisonous chemicals.
B.
Insects can be smarter than they used to be.
C.
Insects can attract their mates to the same plant.
D.
Insects will be attracted to farmers' crops in a time during a year.
【简答题】集中量是代表一组数据____________或___________的量,反映频数分布中大量数据向____________集中的情况。
【单选题】What should be done to prevent insects from eating into the water harvesting system at the bottom?
A.
The two bags holding the water should be put inside the metal tank.
B.
The inner bags need to be replaced every two years.
C.
The water harvesting system should be built on a platform.
D.
A cover should be used to prevent insects from eating it.
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