一号线地铁列车在检修时应注意:在解除MS后()分钟后进行检修

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一号线地铁列车在检修时应注意:在解除MS后()分钟后进行检修

考点:重庆轨道交通重庆电动列车电气维修工(地铁)高二级理论重庆电动列车电气维修工(地铁)高二级理论题库
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从一副52张(没有大小王)的扑克中,每次抽出1张,然后放回洗匀再抽,在实验中得到下列表中部分数据:
实验次数4080120160200240280320360400
出现方块
的次数
1118 404963688091100
出现方块
的频率
27.5%22.5%25%25.25%24.5%26.25%24.3% 25.28%25%
(1)将数据表补充完整;
(2)从上面的图表中可以估计出现方块的概率是:______.
(3)从这副扑克中取出两组牌,分别是方块1、2、3和红桃1、2、3,将它们背面朝上分别重新洗牌后,从两组牌中各摸出一张,若摸出的两张牌的牌面数字之和等于3,则甲方赢;若摸出的两张牌的牌面数字之和等于4,则乙方赢;你认为这个游戏对双方是公平的吗?若不是,有利于谁请你用概率知识(列表或画树状图)加以分析说明.
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请在图中画出斜面上不倒翁受重力和支持力的示意图,并面出重力相对于O点的力臂(黑点表示“不倒翁”的重心)

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用15ml/m3福尔马林加7.5克高锰酸钾对实验动物的饲养室和实验室进行熏蒸消毒,熏蒸后静置()。

A.24-48h

B.48-72h

C.24-48d

D.2-4h

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天赤道

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The recent gasoline price hike has brought some unexpected good results--it has spurred consumer interest in small cars that use less fuel. But there’re discriminatory restrictions against small cars in China, for example, in many cities and regions small cars are not allowed to use expressways or enter downtown areas. And consumers are reluctant to choose the small cars. In contrast, the European Commission requires European cars manufacturers to reduce carbon dioxide emissions for passenger cars, forcing automakers to produce lighter cars with smaller engines.
Topic: Is a smaller and lighter car a better choice
Questions for Reference:
1. What are the advantages and disadvantages of a smaller and lighter car
2. Does your family have a car What are your standards to choose a car
3. Though a smaller and lighter car can play a positive role in environmental protection, many people still prefer a big and expensive car. Why What is a rational attitude toward a car indeed

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