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

2021年5月11日发布的第七次全国人口普查结果显示，我国总人口为141178万人。如图为我国7次人口普查略图，据此完成14～15题。140000 2.09-|||-A-|||-120000-|||-LO1-|||-000-|||-10000-|||-000 1-|||-as-|||-zoooo-|||-1964年 1902年 1990年 2000年 2010年 2020年-|||-金年均增长-|||-4000 o【小题1】数据表明，我国人口近30年来(　　) A. 保持高速增长 B. 人口增长逐渐加快 C. 人口出现负增长 D. 人口总数逐渐增加【小题2】2021年5月31日我国开始实施“一对夫妻可以生育三个子女”政策及配套支持措施。“三孩”政策实施后将(　　)①延缓人口老龄化的进程②有利于提高人口素质③保持合理的劳动力数量④改变我国人口负增长现状 A. ①③ B. ②③ C. ①② D. ②④

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不正确的是()A. 每个簇类的方差累加起来最小B. 每个样本数据分别归属于与其距离最近的聚类质心所在聚类集合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小D. 每个簇类的质心累加起来最小

频数分布的类型可分为( )。A. 正偏态分布与负偏态分布B. 对称分布C. 对称分布与偏态分布D. 对称分布与正偏态分布E. 对称分布与负偏态分布

下列哪个变量为标准正态变量(D)A. (bar(x)-mu)/(s)B. (bar(x)-mu)/(sigma)C. (bar(x)-mu)/(s_(bar{x))}D. (bar(x)-mu)/(sigma_(bar{x))}E. (x-mu)/(s)

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

根据《第七次全国人口普查方案》(摘要)，普查数据采集原则上采用（）的方式。A. 填写纸表B. 电话咨询C. 电子化

(福建泉州泉港区)下面是淘气和笑笑一分跳绳训练的成绩统计-|||-表。(单位:下)(淘气是男生,笑笑是女生)-|||-场次 第一场 第二场 第三场 第四场 第五场-|||-淘气 91 110 135 144 150-|||-笑笑 152 154 -116 93 90-|||-(1)根据统计表中的信息将下面的复式折线统计图补画完整。-|||-(2分)-|||-淘气和笑笑一分跳绳训练成绩统计图-|||-成绩/下 淘气- -笑笑-|||-160-|||-150 、-|||-140 、-|||-130-|||-120-|||-110-|||-100-|||-90-|||-80-|||-0-|||-学 学 动(福建泉州泉港区)下面是淘气和笑笑一分跳绳训练的成绩统计-|||-表。(单位:下)(淘气是男生,笑笑是女生)-|||-场次 第一场 第二场 第三场 第四场 第五场-|||-淘气 91 110 135 144 150-|||-笑笑 152 154 -116 93 90-|||-(1)根据统计表中的信息将下面的复式折线统计图补画完整。-|||-(2分)-|||-淘气和笑笑一分跳绳训练成绩统计图-|||-成绩/下 淘气- -笑笑-|||-160-|||-150 、-|||-140 、-|||-130-|||-120-|||-110-|||-100-|||-90-|||-80-|||-0-|||-学 学 动

3.[判断题] 回归与分类最大的不同在于他们的输出：分类问题输出的是离散的定性的、回归问题输出的值是连续的定量的。A. 对B. 错

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.