张爷爷家种的水稻丰收了,他在院子里把稻谷堆成了一个圆锥形,底面周长是18.84米

题型:解答题

问题:

张爷爷家种的水稻丰收了,他在院子里把稻谷堆成了一个圆锥形,底面周长是18.84米,高是2米.

(1)如果每立方米稻谷重850千克,这堆稻谷重多少吨?(得数保留整数)

(2)如果用一辆每次能装5立方米的车运送,至少要运多少次?

考点:圆锥的体积
题型:解答题

阅读理解。

     Do you often play hide-and-seek (捉迷藏) with others? Most children often play this

game and love to play it. Hide-and-seek is a very old game. Maybe your father and mother

play it. Maybe your grandfather and grandmother do, too.

     How do we know this? Old stories tell about hide-and-seek. Very old pictures also show

the game.

     Boys and girls today play many old games. Big children show little children how to play

them. And so the games live on.

1. Hide-and-seek is _____.[ ]

A. an old picture

B. an old game

C. for your father and mother

D. for your grandfather and grandmother

2. A grandmother is a _____.[ ]

A. mother's father

B. father's mother

C. mother's daughter

D. father's sister

3. This story tells us a _____.[ ]

A. game

B. photo

C. picture

D. sport

4. We know about hide-and-seek from _____ and pictures. [ ]

A. mothers

B. fathers

C. stories

D. all of the above

5. Little children learn games from _____. [ ]

A. TV shows

B. books

C. stories

D. big children

题型:解答题

实验室制取氧气,选择药品时应遵循什么原则?①______,②______,③______,④______,⑤______.

题型:解答题

近代中国,下列为国捐躯的爱国将领牺牲的先后顺序是()。

①关天培

②聂士成

③邓世昌

④左宝贵

A.①②③④

B.②①③④

C.①④③②

D.①②④③

题型:解答题

在水平面上竖直放置一轻质弹簧,有一物体在它的正上方自由落下,自物体接触弹簧至物体速度为0的过程中(    )

A.物体的动能不断减小

B.物体的重力势能不断减小

C.弹簧的弹性势能不断增大

D.物体克服弹簧的弹力做功等于它减少的动能

题型:解答题

釉质发育不全与浅龋区别为

A.患者无症状

B.色素沉着斑

C.探诊粗糙感

D.病损硬而光滑

E.釉质表面缺损

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