更多“柏拉图提出五种政体周期循环的理论：分别是贤人政体、军阀政体、”相关的问题
使用正压式空气呼吸机时，应将空气呼吸器气瓶瓶底向下背在肩上。
A.对 B.错
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皮带机头的消防设施中不少于（）台灭火器。
A、3
B、2
C、1
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企业必须对新上岗、转岗人员进行安全培训并经考试合格，方可安排上岗。
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下列哪项不属于颈椎病的基本分型？（ ）
A.颈型 B.神经根型 C.脊髓型 D.椎动脉型 E.交感型
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The applicants are required to have a bachelor’s degree.
A.Right B.Wrong C.Doesn’t say
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个人网上银行（专业版）采用同一客户使用一个证书的证书体系，同一客户是指客户姓名、身份证件类别及号码等资料完全相同的个人。
A.对 B.错
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位于钻孔内，起到连接钻孔与外界作用的管路统称为()。
A.支管
B.连接管
C.封孔管
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下列评价方法中，可用于寿命期相同的互斥方案选择的有（ ）。
A.净现值法 B.内部收益率法 C.净年值法 D.最小公倍数法 E.追加投资收益率法
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火花间隙法检测绝缘子，作业前校核火花间隙距离，66kV尖—尖电极距离为（）。
A.0.3mm；
B.0.4mm；
C.0.5mm；
D.0.6mm。
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雷电保护等级为特级的通信导航监视设施，其引下线平均水平问距不应大于（）
A.10m
B.12m
C.15m
D.18m
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组胺中毒的机制是（）
A.刺激迷走神经和交感神经腹腔丛 B.作用于外周神经-肌肉接头处收缩毛细血管 C.使外周血管收缩，血压上升 D.扩张毛细血管和收缩支气管 E.收缩毛细血管和扩张支气管
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按乘数一加速数模型政府可以采取什么措施对经济波动实施控制？
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第三篇Spacing in AnimalsFlight Distance Any observant person has noticed that a wild animal will allow a man or other potential enemy to approach only up to a given distance before it flees. "Flight distance" is the terms used for this interspecies spacing. As a general rule, there is a positive relationship between the size of an animal and its flight distance — the larger the animal, the greater the distance it must keep between itself and the enemy. An antelope will flee when the enemy is as much as five hundred yards away. The wall lizard’s flight distance, on the other hand is about six feet. Flight is the basic means of survival for mobile creatures. Critical Distance Critical distance apparently is present wherever and whenever there is a flight reaction. "Critical distance" includes the narrow zone separating flight distance from attack distance. A lion in a zoo will flee from an approaching man until it meets a barrier that it cannot overcome. If the man continues the approach, he soon penetrates the lion’s critical distance, at which point the cornered lion reverses direction and begins slowly to stalk the man. Social Distance Social animals need to stay in touch with each other. Loss of contact with the group can be fatal for a variety of reasons including exposure to enemies. Social distance is not simply the distance at which an animal will lose contact with his group — that is, the distance at which it can no longer see, hear, or smell the group — it is rather a psychological distance, one at which the animal apparently begins to feel anxious when he exceeds its limits. We can think of it as a hidden band that contains the group. Social distance varies from species to species. It is quite short — apparently only a few yards — among some animals, and quite long among others. Social distance is not always rigidly fixed but is determined in part by the situation. When the young of apes and humans are mobile but not yet under control of the mother’s voice, social distance may be the length of her reach. This is readily observed among the baboons in a zoo. When the baby approaches a certain point, the mother reaches out to seize the end of its tail and pull it back to her. When added control is needed because of danger, social distance shrinks. To show this in man, one has only to watch a family with a number of small children holding hands as they cross a busy street.
A．Distance between animals of the same species before fleeing.B．Distance between large and small animals before fleeing.C．Distance between an animal and its enemy before fleeing.D．Distance between certain animal species before fleeing.
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压缩机进气条件变化应包括进气温度、进气压强和进气分子量三个条件。
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