网址:http://m.1010jiajiao.com/timu3_id_2555631[举报]
(本题12分)根据空气质量指数API(为整数)的不同,可将空气质量分级如下表:
对某城市一年(365天)的空气质量进行监测,获得的API数据按照区间,,,,,进行分组,得到频率分布直方图如图.
(1)求直方图中的值;
(2)计算一年中空气质量为良的天数;
(3)某环保部门准备在一年内随机到该城市考察两次空气质量,求两次考察空气质量都为良的概率(结果用分数表示).
查看习题详情和答案>>如图,两木块的的质量分别是m1和 m2,两轻弹簧的劲度系数分别为k1和k2,上面的木块压上面的弹簧上,整个系处于平衡状态,现缓慢向上提上面的木块直到它刚离开上面的弹簧,在这个过程中,下面的木块移动的距离为:( )
A. B. C. D.
查看习题详情和答案>>最近,校园安全成为人们广泛关注的话题,为确保师生安全,你校决定禁止外人进入校园。为此,学校在学生中做了一次“家长该不该进校园及其原因”的调查。调查结果如下图所示:
根据上图信息,请以“Should parents be banned from entering campus?”为题,用英语写一篇100-120个词的短文。要求如下:
1. 简要描述图中的信息(包括人数比率、观点及原因);2. 谈谈你的看法。
注意:文章的标题和开头已给出(不计词数)。
Should parents be banned from entering campus?
Recently, campus security has become a hot issue. To ensure security, strangers are banned from entering campus by our school, and a survey has been made among the students about whether parents should be included.
查看习题详情和答案>>
八、书面表达(满分15分)
最近,校园安全成为人们广泛关注的话题,为确保师生安全,你校决定禁止外人进入校园。为此,学校在学生中做了一次“家长该不该进校园及其原因”的调查。调查结果如下图所示:
根据上图信息,请以“Should parents be banned from entering campus?”为题,用英语写一篇100-120个词的短文。要求如下:
1. 简要描述图中的信息(包括人数比率、观点及原因);2. 谈谈你的看法。
注意:文章的标题和开头已给出(不计词数)。
Should parents be banned from entering campus?
Recently, campus security has become a hot issue. To ensure security, strangers are banned from entering campus by our school, and a survey has been made among the students about whether parents should be included.
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
查看习题详情和答案>>
Directions: Write an English composition in 120 - 150 words according to the instructions given below in Chinese.
最近某学校在学生中做了一次“有烦恼向谁说?”的调查,调查结果如图表示。请你简要描述调查结果,并谈谈你自己的想法。
I am a Senior Three student.Recently we have carried out a survey--"who to share my worry?" The main findings are as follows
查看习题详情和答案>>