绳子绕在半径为50cm的轮圈上,绳子的下端B处悬挂着物体W,如果轮子按逆时针方向

题型:解答题

问题:

绳子绕在半径为50cm的轮圈上,绳子的下端B处悬挂着物体W,如果轮子按逆时针方向每分钟匀速旋转4圈,那么需要多少秒钟才能把物体W的位置向上提升100cm?

考点:弧度制、弧度与角度的互化任意角的三角函数
题型:解答题

“The zoo has money problem,” Grandmother Sandy said.

Angel listened. She heard that Fresno’s Chaffee Zoo didn’t have enough money to take care of its animals.

Angel loved animals. She planned to study them when she grew up. Angel’s family had four cats. Angel took good care of them and made sure that they always had food and water.

Angel felt sorry for the zoo animals. While the others in the family were cooking dinner, Angel was cooking up a way to help the animals. She decided to write a letter to show how she felt. At the end of the letter, she wrote: “Give a dollar, help an animal.” She sent the letter and a dollar to The Fresno Bee, a local newspaper.

A few days after that, Angel’s letter was published. Almost immediately, people began sending in money. Angel’s letter was having effect!

At school, Angel went to each classroom to read the letter that appeared on the newspaper. She asked students in her school to give money to the zoo. Next, Angel was asked to appear on television. She was invited to be on a popular talk show.

The workers in the zoo were very happy. Ray Navarro is the person most responsible(有责任的)for the animals. “Angel opened the eyes of Fresno,” said Ray. “She made us see that people can make a difference.”

小题1:By saying “Angel was cooking up a way to help the animals”, the writer means ___________

A.Angel wanted to cook the animals for food

B.Angel was cooking a meal for the animals

C.Angel wanted to help the animals to run away

D.Angel was thinking of an idea to help the animals小题2:Which is the correct order of the following events?

a. Angel appeared on television.            b. People began sending in money.

c. Angel’s letter was published.            d. Angel asked her schoolmates to give money.

e. Angel wrote the letter to a local newspaper.

A.c-a-b-e-d

B.e-a-b-d-c

C.e-c-b-d-a

D.b-d-e-c-a小题3:Ray Navarro thought that Angel _________.

A.was most responsible for the animals

B.was good at making animals happy

C.helped the people in Fresno

D.could cure blind people

题型:解答题

挤压研磨必须有()

A.磨料室

B.抛光工具

C.电解液

D.二氧化碳气体

题型:解答题

进行能见度观测时,如果没有或看不到更远的目标物,而能看到的目标物的颜色、细小部分清晰可辨时,该方向的能见度通常可判定为该目标物距离的()倍以上。

题型:解答题

机车在运行中气压调压器发生故障时可采取哪些措施?

题型:解答题

六、技能应用题


下面这篇文章是一个四年级学生所写的日记,请仔细阅读这篇习作,然后完成后面的题目。
今天是个阳光灿烂的一天,这一天即将迎来的是期末考试和春节。
昨天我们考了科学和英语,今天考语文和数学,其实,只要不紧张正常发挥就一定能考好的。你别说,我还真不觉得这张试卷和平常做的试卷有什么不同,也不是很难。还有,自己要给自己加油,也要自信,如果,你没了自信,就会考不好,如果你有自信,就会考好。如果,你仔
细的话一定会发现这两个字“检查”。今天考试,我就用到了这两个字,我细心地检查发现了许多写错的地方,比如:每年汛期,山洪暴发,溪水猛张。叫我们从这句话里找出三个错别字改过来,把正确的写在三个空格里,我写了“讯”“暴”和“涨”,可我在检查时发现,不是通讯的讯,于是我就改成了三点水的汛。

为这篇习作拟写一则简短的作文评语。
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