某市五月份连续五天的日最高气温分别为23、20、20、21、26(单位:°C),

题型:选择题

问题:

某市五月份连续五天的日最高气温分别为23、20、20、21、26(单位:°C),这组数据的中位数和众数分别是(    ).

A. 22°C,26°C             B. 22°C,20°C

C. 21°C,26°C             D. 21°C,20°C

考点:全面调查和抽样调查频数与频率直方图扇形图
题型:选择题

阅读短文,选择正确答案。

    Mr Johnson had a son and he loved his son very much, because the boy was his only son. However, the boy

was not very cute and often made other people unhappy by some bad words. One day Mr Johnson was invited

(被邀请) to a party. His son wanted to go there, too But Mr Johnson said, "No, my good friend will have the

party in his house. It is for the first birthday of their daughter. There will (将) be a lot of important people to join

in the party, and I'm afraid (恐怕) that you may say some bad words." The son said to his father "I will not say

anything rude (粗鲁的) at the party". So the father agreed (同意). After they got to the friend's house, the son

did not say anything at the party. Then when the party was about to (即将) end and all the guests stood up, he

also stood up and said, "You know, everybody, I didn't say anything today. So if the baby dies (死) this year, it

is not my fault."

1. How many sons did Mr Johnson have? [ ]

A. One

B. Two

C. Three

D. Four

2. How old is the friend's daughter? [ ]

A. One years old

B. Two years old

C. Three years old

D. Only one month old

3. Who will the good friend have the birthday party for? [ ]

A. His son

B. His daughter

C. Mr Johnson's son

D. Mr Johnson

4. What does "my fault" mean (意思) in the last sentence? [ ]

A. 我的话

B. 我的错误

C. 我的祝福

D. 我的晚会

题型:选择题

蔡某,男,50岁。诊断为原发性高血压,吸烟史30年,超重,目前血压140/90mmHg。下列健康教育措施错误的是()

A.保持情绪稳定

B.适量运动

C.麦淀粉饮食

D.戒烟

E.继续服降压药

题型:选择题

某校化学研究性学习小组对氯气的性质和用途进行了调查分析,了解了氯气能应用 于衣物漂白、水体的杀菌和消毒的原理。

(1) 氯气溶于水可用于漂白、消毒的原因是_______,反应的离子方程式为_______ ;

(2) 通常使用漂白液(NaClO溶液)作漂白剂而不用氯气的理由是_____(写出一项即可);

(3) 在一定量的石灰乳中通入一定量的氯气,二者恰好完全反应 (发生的反应均为放热反应)。最终生成物中含有Cl-、 ClO-、ClO3-三种含氯元素的离子,其中ClO-、ClO3-两种离 子的物质的量(n)与反应时间(t)的变化曲线如下图所示。

①O-t1时间内,Ca(OH)2与Cl2发生反应的化学方程式为_______;

②t2时,Ca(OH)2与Cl2发生反应的总的化学方程式为_______

③该石灰乳中含有Ca(OH)2的质量是_______g;

题型:选择题

回填一般粘性土时,在下述哪种情况下压实效果最好()?

A.土的含水率接近液限

B.土的含水率接近塑限

C.土的含水率接近缩限

D.土的含水率接近天然含水率

题型:选择题

机动车仪表板上(如图所示)这个符号表示什么?()

A.冷风暖气风扇

B.空调制冷

C.空气循环

D.雪地起步模式

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