一个等腰三角形,它的一个底角是50°,它的顶角是______,一个等边三角形的边

题型:填空题

问题:

一个等腰三角形,它的一个底角是50°,它的顶角是______,一个等边三角形的边长是9厘米,它的周长是______厘米.

考点:等腰三角形,等边三角形
题型:填空题

由于易被空气中的氧气氧化而不能长期存放在敞口容器中的是(  )

A.浓硫酸

B.硫酸亚铁(FeSO4)溶液

C.NaOH溶液

D.过氧化钠(Na2O2

题型:填空题

在进行标本数量较大、样本率近似正态分布时,其显著性检验时,应选用下列哪种检验方法().

A.t检验

B.χ2检验

C.u检验

D.t’检验

E.F检验

题型:填空题

罗马法规定,贷款月息不得超过贷款额的百分之一,超过此限额者应处以四倍于所得利息的罚款。这表明[ ]

A.私有财产权不可侵犯

B.债务人与债权人关系紧张

C.高利贷已成为严重社会问题

D.运用法律调节借贷关系

题型:填空题

He is fourteen ______ old. [ ]

A. year  

B. /  

C. year's  

D. years

题型:填空题

     What could be simpler than shaking fruit from a tree? Well, the job is a lot more difficult than you

might think. There is a right way and a wrong way to shake a fruit tree. And a person who is a good

apple tree shaker may not be a good cherry tree shaker. Different fruits take different shakes .

     As a rule, a slow hard shake is best. This makes the fruit fall much faster than a light; quick jiggle.

Most fruits have a set number of shakes per minute that will do the best job of getting them out of the

tree and onto the ground. To shake down plums, try shaking the tree four hundred times per minute,

moving the tree two inches at each shake. Experts say you'll get three times more fruit from the tree than

you will if you shake eleven hundred times per minute at one inch per shake. Cherries, because they are

smaller, need more shaking. A good rate of shaking seems to be about twelve hundred shakes per minute. Apples, like plums, need four hundred shakes.

     Of course, some people may choose to take no notice of all these expert directions for shaking fruit.

Keeping track of all the numbers can be enough to drive some people up a tree.

1. This passage is about ______.

A. eating plums                      

B. how to shake fruit from a tree

C. the value of fruits and vegetables      

D. ways in which people shake

2. A smaller fruit tree normally requires ______.

A. more people        

B. less shaking

C. two people per tree    

D. more shaking

3. The writer ends this story with ______.

A. a serious thought  

B. a suggestion for other ways to get fruit from trees

C. a joke            

D. a warning

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