测验题目很难的话,测验结果会成()。 A.正态分布 B.正偏态分布 C.负偏态分布

题型:单项选择题

问题:

测验题目很难的话,测验结果会成()。

A.正态分布

B.正偏态分布

C.负偏态分布

D.双峰分布

考点:教育心理学教育心理学题库
题型:单项选择题
理想变压器原线圈接在如图所示的电压上,原副线圈匝数之比为10:1,串在原线圈上的电流表的示数为1A,则以下叙述正确的是(  )

A.变压器输出功率为200W

B.若n1=100匝,则输出端线圈的磁通量变化率的最大值为2Wb/s

C.副线圈两端的电压表示数20V

D.变压器的输入功率是由发电厂的输出功率决定的

题型:单项选择题

诉衷情 陆游

当年万里觅封侯,匹马戍梁州。关河梦断何处?尘暗旧貂裘。胡未灭,鬓先秋,泪空流。此生谁料,心在天山,身老沧洲!

小题1:诗中“当年万里觅封侯”说明作者年青时候的愿望是(   )(2分)

A、为国家建功立业    B、获得侯的爵位     C、获取高官厚禄

小题2:诗中表明作者即使在梦里也不忘记国事的诗句是:                   (2分)

题型:单项选择题

The Healthy Habits Survey(调查)shows that only about one third of American seniors have correct habits. Here are some findings and expert advice.

1.How many times did you brush your teeth yesterday?

·Finding:A full 33% of seniors brush their teeth only once a day.

·Step:Remove the 300 types of bacteria in your mouth each morning with a battery-operated toothbrush. Brush gently for 2 minutes, at least twice a day.

2.How many times did you wash your hands or bathe yesterday?

·Finding:Seniors, on average, bathe fewer than 3 days a week. And nearly 30%wash their hands only 4 times a day—half of the number doctors recommend.

·Step:We touch our faces around 3,000 times a day-often inviting germs(病菌)to enter our mouth, nose, and eyes.Use toilet paper to avoid touching the door handle. And, most important, wash your hands often with hot running water and soap for 20 seconds.

3.How often do you think about fighting germs?

·Finding:Seniors are not fighting germs as well as they should.

·Step:Be aware of germs. Do you know it is not your toilet but your kitchen sponge(海绵)that can carry more germs than anything else? To kill these germs, keep your sponge in the microwave for 10 seconds.

小题1:What is found out about American seniors?

A.Most of them have good habits.

B.Nearly 30%of them bathe three days a week.

C.All of them are fighting germs better than expected.

D.About one third of them brush their teeth only once a day.小题2:Doctors suggest that people should wash their hands ________.

A.twice a day

B.three times a day

C.four times a day

D.eight times a day小题3:Which of the following is true according to the text?

A.We should keep from touching our faces.

B.There are less than 300 types of bacteria in the mouth.

C.A kitchen sponge can carry more germs than a toilet.

D.We should wash our hands before touching a door handle.小题4:The text probably comes from________.

A.a guide book

B.a popular magazine

C.a book review

D.an official document

题型:单项选择题

《韩非子》载“上古之世……民食瓜果蚌蛤,腥臊恶臭,民多疾病,有圣人作,钻燧取火,以化腥臊。”懂得“钻燧取火”的我国远古居民相当于( )。

A.元谋人
B.蓝田人
C.北京人
D.山顶洞人

题型:单项选择题

“十二五”期间,预计我国建设管道总长度将超过()公里。

A.2万

B.3万

C.4万

更多题库