一定质量分数的硝酸钾溶液可用做无土栽培的营养液。请通过计算回答: (1) 硝酸钾

题型:计算题

问题:

一定质量分数的硝酸钾溶液可用做无土栽培的营养液。请通过计算回答:

(1) 硝酸钾中钾元素、氮元素、氧元素的质量比是             

(2)某蔬菜基地欲配制300kg溶质质量分数为8%的硝酸钾溶液,需要硝酸钾       kg,

       kg。

考点:物质组成元素的质量比化学式的写法和意义物质组成元素的质量分数化合价的求法
题型:计算题

上证基金指数和深圳基金指数均是从交易所上市基金中选取部分基金作为样本进行编制。()

题型:计算题

阅读下列材料:

材料一 唐太宗说:“往昔初平京师,宫中美女珍玩,无院不满。炀帝意犹不足,征求不已,兼东征讨,穷兵黩武,百姓不堪,遂致灭亡。此皆朕所目见。故夙夜孜孜,惟欲清静,使天下无事。”

材料二 唐太宗引用古人的话说:“君,舟也;人,水也;水能载舟,亦能覆舟。”

材料三 唐太宗说:“为君之道,必须先存百姓,若损百姓以奉其身,犹割股以啖腹,腹饱而身毙。”由是二十年间,风俗简朴,衣无锦绣,财帛富饶,无饥寒之弊。 

材料四 唐太宗对大臣们说:“朕终日孜孜,非但忧怜百姓,亦欲使卿等长守富贵。”

——均摘自《贞观政要》 

请回答:

⑴ 根据材料一,分析唐太宗认为隋朝灭亡的原因是什么?(3分)

⑵ 根据材料二,指出唐太宗把君和民的关系比做什么?他是如何得出该结论的?(2分)

⑶ 用经济方面的具体史实说明唐太宗是如何实践材料三中的“存百姓”这一思想的?唐太宗“二十年间”的统治获得了怎样的誉称?(3分)

⑷ 结合所学知识,你认为材料四中唐太宗“终日孜孜”的根本原因是什么?(2分)

题型:计算题

This is time of year when we think about giving and receiving presents. Can you find a little extra to give? On this page we suggest a few organizations you might like to help.

Littleton Children’s Home

We don’t want your money, but children’s toys, books and clothes in good condition would be very welcome.

Also—we are looking for friendly families who would take our children into their homes for a few hours or days as guests. You have so much—will you share it?

Phone Sister Thomas on 55671.

Children’s Hospice

We look after a small number of very sick children. This important work needs skill and love. We cannot continue without gifts of money to pay for more nursing staff. We also need story books and toys suitable for quiet games.

Please contact The Secretary, Little Children’s Hospice, Newby Road.@m

Street Food

In the winter weather, it’s no fun being homeless. It’s even worse if you’re hungry. We give hot food to at least fifty people every night. It’s hard work, but necessary. Can you come and help? If not, can you find a little money? We use a very old kitchen, and we urgently need some new saucepans. Money for new ones would be most welcome indeed.

Contact Street Food, c/o Mary’s House, Elming Way, Littleton. Phone 27713.

Littleton Youth Club

Have you got an unwanted chair?—a record player?—a pot of paint?

Because we can use them!

We want to get to work on our meeting room!

Please phone 66231 and we’ll be happy to collect anything you can give us.

Thank you!

The Night Shelter

We offer a warm bed for the night to anyone who has nowhere to go. We rent the former Commercial Hotel on Green Street. Although it is not expensive, we never seem to have quite enough money. Can you let us have a few pounds? Any amount, however small, will be such a help.

Send it to us at 15, Green St, Littleton. Please make check payable to Night Shelter.

小题1:Reading the passage, you might like to help these organizations which work for     

A.homeless and sick children

B.less fortunate members of our society

C.hungry people who have no beds to sleep in

D.friendly members of our society to help others小题2:If you like children and can offer a happy family to a homeless child, you may go to     .

A.Street Food

B.Night Shelter

C.Children’s Home

D.Children’s Hospice小题3:We can infer that      .

A.there are too many social problems in this country

B.people are very poor during the time for giving presents

C.warm-hearted people like to give away money

D.this passage is taken from a local newspaper小题4:If your child has grown up, you may take the child’s things to       .         

A.Children’s Home and Children’s Hospice

B.Youth Club and Children’s Home

C.Children’s Hospice and Night Shelter

D.Youth Club and Night Shelter

题型:计算题

建筑外门窗进行()检测时,采用严重渗透压力值得前一级压力值作为分级指标。

A、气密性

B、水密性

C、抗风压性能

D、强度

题型:计算题

下面哪一种物理访问控制能够对非授权访问提供最高级别的安全?()

A.bolting门锁

B.Cipher密码锁

C.电子门锁

D.指纹扫描器

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