如图所示,质量m=1kg的小球用细线拴住,线长l=0.5m,细线所受的拉力达到F

题型:计算题

问题:

如图所示,质量m=1kg的小球用细线拴住,线长l=0.5m,细线所受的拉力达到F=18N时就会被拉断;当小球从图示位置释放后摆到悬点的正下方时,细线恰好被拉断;若此时小球距水平面的高度h=5m,重力加速度g取10m/s2,求小球落地处与细线恰被拉断时的位置间的距离?

考点:匀速圆周运动
题型:计算题

阅读理解。

     It is Mike's birthday today.His mother buys a lot of food from the supermarket.Look at the table.There is a lot of

food on it.There are cakes,hamburgers,dumplings,meat,and fish.She buys a lot of drinks,too.There are coffee,coke,

apple juice,orange juice.There is tea,too.

     Mike asks some of his friends to his birthday party.They are Tom,Mary,Betty and Lily.All the children are eating

and drinking happily at the table.Lily is from China.She doesn't like coffee very much.She likes tea,coke and juice.All

the other children are all American.  They love coffee very  much.  They all enjoy the food.   After the dinner,  all the

children are singing and dancing.Lily sings a Chinese song.She sings very well.All the other children love her song

very much.The other children can't sing in Chinese,so they sing in English.All of them have a good time.

1.Why does Mike's mother buy so many things?

A.Because it is her birthday.

B.Because it is Mike's birthday.

C.Because Mike likes to eat them.

D.Because it is Mike's father's birthday.

2.How many children are there at the party?

A.There are five.

B.There are three.

C.There are four.

D.There are six.

3.Lily doesn't like        very much.

A.coke

B.coffee

C.orange

D.tea

4.Lily comes from        .

A.America

B.Japan

C.China

D.Canada

510.What do the children do after the dinner?

A.They see a film.

B.They watch TV.

C.They play football.

D.They sing and dance.

题型:计算题

已知x2-5x=6,则10x-2x2+5=______.

题型:计算题

物业管理投标的过程包括:①准备投标文件;②获取投标信息;③登记并取得招标文件;④参加开标、现场答辩会议;⑤送交投标文件;⑥签订物业服务合同(或前期物业服务合同)。正确的投标步骤是()。

A.③②①④⑤⑥

B.③②①⑤④⑥

C.②③①④⑤⑥

D.②③①⑤④⑥

题型:计算题

下列关于普通型流行性脑脊髓膜炎的叙述,错误的是()

A.发病急骤

B.脑脊液检查外观浑浊

C.脑脊液检查以淋巴细胞为主

D.皮肤黏膜是具有诊断意义的体征

E.早期无明显症状

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在建设工程施工阶段,监理工程师进度控制的工作内容包括()。

A.审查承包商调整后的施工进度计划

B.编制施工总进度计划和单位工程施工进度计划

C.协助承包商确定工程延期时间和实施进度计划

D.按时提供施工场地并适时下达开工令

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