某条河宽度为700m,河水均匀流动,流速为3m/s.若小船在静水中的运动速度为5

题型:计算题

问题:

某条河宽度为700m,河水均匀流动,流速为3m/s.若小船在静水中的运动速度为5m/s,则小船的船头向哪个方向行驶才能恰好到达河的正对岸?渡河时间为多少?

考点:运动的合成与分解
题型:计算题

阅读理解。

     No one knew how to study when he or she was a baby. You need to learn

to do some things first. They make it easier for you to learn and do well in class.

     Pay Attention(专心) in Class

     It's a good start for learning. It can help you know what the teacher says, and

it will help you learn more and faster.

     Take Good notes

     Taking good notes can make it easier to study. Be sure to write down all of

the important things that your teacher says or writes on the blackboard, then

read them after class.

     Plan Ahead(提前计划)

     Don't wait until Thursday night to study for Friday's test. Planning ahead

can help you get good grades. You can plan what to do and how much to do

each day.

     Ask for Help

     What should you do if you are confused about something? Be sure to

(一定要)ask your teacher for help. You can also ask some other people, like

your classmates, your mom or dad.

1. How many things to help to learn well are mentioned(提到) in this passage?

A. Three

B. Four

C. Five

D. Six

2. We need to learn these things because they can _______.

A. keep us healthy

B. make it easier to learn

C. help us become clever

D. make us strong

3. We should write down _______ when we take notes in class.

A. the important things that the teacher tells and writes

B. the things that we like

C. the things that we are sure about

D. the things that interesting

4. The underlined word "confused" means _______ in Chinese.

A. 惊诧的

B. 困惑的

C. 恐惧的

D. 讨厌的

5. What can we learn from the passage?

A. Reading the notes after class is a good start.

B. We should study well for Friday's test.

C. Learning how to learn is very important.

D. Planning ahead can help you know what the teacher says

题型:计算题

经济型数控系统的自诊断功能往往比较强。

题型:计算题

简述儿童手的触觉的发展趋势。

题型:计算题

陈胡公妫满系舜帝之子商均的32世孙。公元前1046年,周武王灭商建周,把他封于陈,侯爵,并将长女太姬嫁给他。对此,以下解读不正确的是()

A.西周初年曾经分封过异性贵族

B.周统治者通过政治联姻巩固统治

C.陈胡公在封国内居于大宗地位

D.陈胡公可按照自己的喜好选择继承人

题型:计算题

新生儿的原始反射,不包括下列哪项

A.觅食反射
B.吸吮反射
C.握持反射
D.拥抱反射
E.腹壁反射

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