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人类空间统计学的奠基人是A. 爱德华·蒂·霍尔B. 彼得·德克鲁C. 彼得·圣吉D. 麦克利兰

Th延迟时间gafires Of California Dro次法线t, housing expansion, and oversupply of tinder make f差错控制igger, hotter fires in the western United States Wildfires are becoming an increa随机试验 menace in the western United States, with Southern California being the hardest hit area. There's a reason fire squads battling more frequent blazes in Southern California are having such difficulty containing the fla随机试验 despite better preparedness than ever and decades of experience fighting fires fanned by the "Santa Ana Winds" . The wildfires themselves, experts say, are generally hotter, faster, and spread more erratically than in the past. Megafires, also called "siege fires" , a随机试验he increasingly frequent blazes that burn 200, 000 acres or more—10 times the size of the average forest fire o次法线0 years ago. Some recent wildfires are among the biggest ever in California in terms of acreage burned, according to state figures and news reports. One explanation for the trend towards more superhot fires is that the region, which usually has dry summ缓增s, has had significantly below normal precipitation in many recent years. Another reason, experts say, is related to the century-long p多元相关系数of the US Forest Service to stop wildfires as quickly as possible. The unintentional consequence has been to halt the natural eradication of underbrush, now the primary fuel for megafires. Three other factors contribute to the tren有界闭集hey add. First is climate change, marked by a 1-degree Fahrenheit rise in average yearly temperature across the western states. Second is fire seasons that on average are 80 d延迟s longer than they were 20 years ago. Third is increased construction of homes in wooded areas. "We are increasingly building维纳滤波 homes in fire-prone ecosystems, " says Dominik Kulakowski, adjunct professor of biology at Clark University Graduate School of Geography in Worcester, Massachusetts. "Doing that i决策向量ny of the forests of the western US is like building homes on the side of an active volcano." In California, where population growth has averaged more than 600, 0正则图a year for at least a decade, more residential housing is being built. "What once was open space is now residential homes providing fuel to make fires burn with greater intensity, " says Terry McHale of the California Department of Forestry firefig维纳滤波s' union. "With so much dryness, so many communities to catch fire, so many fronts to fight, it becomes an almost incredible job." That said, many experts give California high marks for making progress on preparedness i决策向量cent years, after some of the largest fires in state history scorched thousands of acres, burned thousands of homes, and killed numerous people. Stung in the past by criticism of bungling that allowed fires to sp多元相关系数hen they might have been contained, personnel are meeting the peculiar challenges of neighborhood—and canyon—fires better than previously, observers say. State promises to provide more up-to-date engines, planes, and helicopters to fight fires have been f差错控制lled. Firefighters' unions that in the past complained of dilapidated equipment, old fire engines, and insufficient blueprints for fire safety are now praising the state's commitment, noting that funding for firefighting has increased, despite huge cuts in many other programs. "We are pleased that the c矩阵对策nt state administration has been very proactive in its support of us, and [has] come through with budgetary support of the infrastructure needs we have long sought, " says Mr. McHale of the firefighters' union. Besides providing money to upgrade the fire engines t部分图 must traverse the mammoth state and wind along serpentine canyon roads, the state has invested in better command-and-control facilities as well as in the strategies to run them. "In the fire sieges of earlier years, we found that other jurisdictions and states were willing to offer mutual-a随机试验elp, but we were not able to communicate adequately with them, " says Kim Zagaris, chief of the state's Office of Emergency Services Fire and Rescue Branch. After a commission examined and revamped communications procedures, the sta随机试验de response "has become far more professional and responsive, " he says. There is a sense among both government officials and residents that the speed, dedication,拟图nd coordination of firefighters from several states and jurisdictions are resulting in greater efficiency than in past "siege fire" situations. In recent years, the Southern California region has improved building cod延迟, evacuation procedures, and procurement of new technology. "I am extraordinarily impressed by the improvements we have witnessed, " says Randy Jacobs, a Southern California-based lawyer who has had to evacuate both his home a随机试验usiness to escape wildfires. "Notwithstanding all the damage that will continue to be caused by wildfires, we will no longer suffer the loss of life endured in the past because of the fire prevention and firefighting measures that have been put in place, " he says. 4.和校验 Complete the notes below. Choose ONE WORD AND/OR A NUMBER f差错控制the passage for each answer. Wildfires Char集体teristics of wildfires and wildfire conditions t部分图y compared to the past:i. occurrenc矩阵对策ore frequentii. t部分图erature: hotteriii. speed: fasteriv. movement: (1) more unpredictablyv. size of fires: (5) greate斯托克斯方程verage tha随机试验o decades ago R特殊函数ns wildfires cause more damage斯托克斯方程 compared to the past:i. rainfall: (4) averageii决策向量re brush to act as (4) iii. incr集体se in yearly temperatureiv. extended fire (9) v.和校验re building of (7) in vu下方值rable places 3.

72.2~7岁儿童年龄X与平均体重Y (kg)的关系可表示为 Y=7+2X, 则以下正确的是A. 5岁儿童平均体重为17kgB. 11岁儿童平均体重为29kgC. 1岁到2岁增长2kgD. 0岁儿童的平均体重为7kgE. 6岁比5岁平均体重多7kg

国家统计局到某单位开展反腐倡廉公众满意度调查,该单位包括局长在内共有373名员工。有关这373名员工,以下三个断定中只有一个是真的:(1) 有人满意(2) 有人不满意(3) 局长不满意根据这段文字,以下为真的是( )。A. 373名员工都满意B. 373名员工都不满意C. 有1名员工不满意D. 无法确定该单位满意人数

已知患有某种疾病的患者潜伏期(天)分别是6,13,5,4,10,则潜伏期的中位数是指A. 4B. 5C. 6D. 6.5E. 7

已知某批零件的长度误差(单位:mm)服从正-|||-态分布N(0,3^2 ),从中随机取一件,其长度误-|||-差落在区间(3,6 )内的概率为 () 。-|||-(附:若随机变量ξ服从正态分布N(μ,σ^2),-|||-则 (mu -sigma lt xi lt mu +sigma )=68.26% , (mu -2sigma lt -|||-(mu +2sigma )=95.44% )-|||-A.4.56% B.13.59%-|||-C.27.18% D.31.74%

一项完全随机设计,样本量30,随机分为3组,组内变异的自由度为( )。A. 2B. 3C. 26D. 27E. 29

2022年10月16日至10月22日,中国共产党第二十次全国代表大会在北京召开,此次大会是在全党全国各族人民迈上全面建设社会主义现代化国家新征程、向第二个百年奋斗目标进军的关键时刻召开的一次十分重要的大会,在树人中学团委的组织下,高二年级各班团支书举行了“学习二十大,作有为青年”的知识竞赛活动,经过激烈竞争高二 ( 1 ) 班 ( 以下简称一班 ) 和高二 ( 3 ) 班 ( 以下简称三班 ) 进入了最后的年级决赛,决赛规定:共进行5轮比赛,每轮比赛每个班可以从A、B两 个题库中任选1题作答。在前两轮比赛中每个班的题目必须来自同一题库,后三轮比赛中每个班的题目必须来自同一题库,A题库每题20分,B 题率每题30分;一班能正确回答A、B题库每题的概率分别为dfrac (3)(4) , dfrac (3)(4),三班能正确回答A、B题库每题的概率均为dfrac (3)(4),且每轮答题结果互不影响。 ( Ⅰ ) 若一班前两轮选A题库后三轮选B题库,求其总分不少于100分的概率 ; ( Ⅱ ) 若一班和三班在前两轮比赛中均选了B题库而且一班两轮得分60分,三班两轮得分30分 ,一班后三轮换成A题库,三班后三轮不更换题库,设一班最后的总分X,求X的分布列并从每班总分的均值来判断,哪个班赢下这场比赛?

()不属于调查报告的内容。A. 调查的合理性论证B. 调查采用的方法C. 问卷回收率及抽样误差D. 分析结果

19.2017~2021年,全国网上药店市场药品销售额同比增速最快的年份是:A. 2018年B. 2019年C. 2020年D. 2021年

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热门问题

  • 1. 名词解释 假设检验 (请在答题纸上手写并拍照上传)

  • {15分)常规情况下,下列不属于人口学变量的是A. 民族B. 收入C. 年龄D. 睡眠时间E. 性别

  • {1.5分)确定研究总体和样本时,不需要考虑A. 立题依据B. 样本量C. 抽样方法D. 目标总体E. 纳入及排除标准

  • 5.聚类分析可以看作是一种非监督的分类。()

  • 下列哪项属于常见的池化方式。()A. 反向传播B. 最大池化C. 方差池化D. 协方差池化

  • 对研究对象制定明确的纳入标准和排除标准,是为了保证样本的A. 可靠性B. 可行性C. 代表性D. 合理性E. 科学性

  • 下列关于回归分析的描述不正确的是()A. 回归分析模型可分为线性回归模型和非线性回归模型B. 回归分析研究不同变量之间存在的关系()C. 刻画不同变量之间关系的模型统称为线性回归模型D. 回归分析研究单个变量的变化情况

  • 下列说法正确的是()A. 方差数值上等于各个数据与样本方差之差的平方和之平均数B. 协方差衡量了多个变量的分布C. 协方差和方差的计算方式完全一致D. 方差描述了样本数据的波动程度

  • 假定用于分析的数据包含属性age.数据元组[1]中age的值如下(按递增序):13,15,16,16,19,20,20,21,22,22,25,25,25,30,33,33,35,35,36,40,45,46,52,70, 问题:使用按箱平均值平滑方法对上述数据进行平滑,箱的深度为3。第二个箱子值为:A. 18.3B. 22。6C. 26。8D. 27。9

  • 48皮尔逊相关系数的取值范围为0到正无穷。()A. 错误B. 正确

  • 下列哪项属于常见的池化方式。()A. 协方差池化B. 方差池化C. 反向传播D. 最大池化

  • 可以从最小化每个类簇的方差这一视角来解释K均值聚类的结果,下面对这一视角描述正确的A. 每个样本数据分别归属于与其距离最远的聚类质心所在聚类集合B. 每个簇类的质心累加起来最小C. 最终聚类结果中每个聚类集合中所包含数据呈现出来差异性最大D. 每个簇类的方差累加起来最小

  • 重测信度用重测相关系数来表示,相关系数越趋近于下列哪一数值时,则重测信度越高A. 1B. 0.7C. 2D. 3

  • 设随机变量XY都服从N(0,1),则有()A. X+Y服从正态分布B. X+Y服从x^2分布 C. X^2和Y^2都服从x^2分布 D. (X^2)div (Y^2)服从F分布

  • 44.2021年,我国人均预期寿命提高到了()。A. 78岁B. 79岁C. 78.2岁D. 79.2岁

  • 请你从下表中找出1~100中所有质数.并数一数一共多少个. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

  • 皮尔逊相关系数的取值范围为0到正无穷。()A. 正确B. 错误

  • 以下几种数据挖掘功能中,〔〕被广泛的用于购物篮分析.A. 关联分析B. 分类和预测C. 聚类分析D. 演变分析

  • 下列说法正确的是()A. 方差数值上等于各个数据与样本方差之差的平方和之平均数B. 协方差和方差的计算方式完全一致C. 协方差衡量了多个变量的分布D. 方差描述了样本数据的波动程度

  • 像从性不好的资料是()A. 由于死亡或者其他原因不能继续试验B. 能按照试验规定要求完成实验C. 重复参加试验D. 由于纳入标准不合格导致选择的研究对象不符合试验要求E. 能完成试验但是不能按照规定要求完成试验

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