一考古工作者发现了一个古代小酒杯,小明,小红和小李想用不同器材测出小酒杯的密度.

题型:问答题

问题:

一考古工作者发现了一个古代小酒杯,小明,小红和小李想用不同器材测出小酒杯的密度.(酒杯的密度大于水的密度,酒杯的直径小于量筒的直径,空酒杯可以在水中漂浮,水的密度ρ已知)请你将他们的测量过程补充完整.(用物理符号表示最终结果)

(1)小明利用天平、量筒、细线和水进行测量,过程如下:

①用天平测出小酒杯的质量为m

②在量筒中倒入适量的水,记下其示数为V1

③用细线拴住小酒杯,放入量筒中,当小酒杯______时(无气泡),记下此时的示数为V2

④小酒杯密度的表达式为ρ=______

(2)小红利用弹簧测力计、烧杯、细线和水进行测量,过程如下:

①用弹簧测力计测出小酒杯的重力G

②用细线悬挂小酒杯浸没于盛有足量水的烧杯中(未接触烧杯底部且无气泡),读出弹簧测力计示数为F

③算出小酒杯受到的浮力为______;小酒杯质量为______,体积为______;______

④小酒杯密度的表达式为ρ=______

(3)小李利用量筒、细线和水,测量过程如下:

①在量筒中倒入适量的水,记下其示数为V1

②把小酒杯放入量筒中,让其漂浮,记下此时的示数为V2,则小酒杯受到的浮力为______

③把小酒杯浸没在量筒内的水中(无气泡),记下此时的示数为V3,则小酒杯的体积为______

④小酒杯密度的表达式为ρ=______.

考点:浮力及阿基米德原理物体的浮沉条件及其应用固体密度的测量
题型:问答题

地球是由无数个循环系统组成,例如地球水循环系统:水被蒸发,又以雨雪的方式降落下来,不听反复。水生生物循环系统:大鱼吃小鱼,小鱼吃浮游生物,浮游生物又以鱼的排泄物为食。人类社会也是一个大系统,不同发展程度的国家相互之间不断加强联系,相互作用,推动着整个社会的发展。这说明系统具有

A.整体性

B.结构性

C.层次性

D.开放性

题型:问答题
I became a gardener when I was twelve. My early   36  of gardening may not have originated from my love for nature. It was to   37  my parents.
At that time, we had a big yard in which a beautiful maple tree stood. But my mother often looked with  38  at this work of natural art. Those golden leaves seemed like tons of rubbish to her, “something else to   39  !”Seeing the neighbors busy with gardening, my father even thought it a waste of time.
At that age, I always did something   40   to whatever my parents did!If gardening were something they found  41  , I would plant a garden!
I planted some lily(百合花)seeds in the yard. But they failed to   42 . I continued to plant sunflower seeds and roses. Wild  43 joy, I found the first rose bloom(开花). One by one, the flowers bloomed their heads off. 44  , I was touched by this land of wonder.
  45 , my parents showed no interest in my garden. My father even   46  at me because he found it was  47  to move around my garden to the driveway. To my mother’s   48  , I put in her vase my real roses which, in her eyes, were simply weeds 49  flowers.
Regardless of their   50  , I kept on planting my garden and  51 to enjoy the pleasure of gardening. Plants make such good companions: they breathe, they bloom, they   52  to care and love.
It has been many years since I made my first garden out of my desire to  53  my parents. Today I become known as Mrs. Greenthumbs, teaching gardening and hosting a gardening show, which makes my parents feel very   54  . And now I could say it is my affection for  55   that makes me a real gardener.
小题1:
A.memoryB. dreamC. intention D. design
小题2:
A.pleaseB. changeC. helpD. annoy
小题3:
A.doubt B. appreciationC. surpriseD. excitement
小题4:
A.collect upB. care aboutC. clean upD. come in
小题5:
A.equal B.similarC. superiorD. opposite
小题6:
A.painful B. valuableC. upsettingD. interesting
小题7:
A.come up B.break outC. hold onD. get through
小题8:
A.toB. withC. inD. by
小题9:
A.Luckily B.CheerfullyC. RegularlyD. Eventually
小题10:
A.Instead B. HoweverC. ThereforeD. Besides
小题11:
A. shoutedB. laughedC. glancedD. jumped
小题12:
A.convenientB. troublesomeC. enjoyableD. dangerous
小题13:
A.sadness B. displeasureC. delight D. relief
小题14:
A.other thanB. more thanC. rather thanD. less than
小题15:
A.dislike B. encouragementC. threatD. suggestion
小题16:
A.decided B. stoppedC. continuedD. struggled
小题17:
A.devoteB. turn C. respond D. lead
小题18:
A.defeatB. satisfyC. respectD. challenge
小题19:
A.proud B. comfortableC. strangeD. disappointed
小题20:
A.freedom B. lifeC. growthD. nature
题型:问答题

25℃、101kPa时,1g甲醇完全燃烧生成CO2和液态H2O,同时放出22.68kJ热量,下列表示该反应的热方程式正确的是 [ ]

A.CH4O(l)+3/2O2(g)==CO2(g)+2H2O(l);△H=-725.8kJ·mol-1

B.2CH4O(l)+3O2(g)==2CO2(g)+4H2O(l);△H=+1451.6kJ·mol-1

C.2CH4O(l)+3O2(g)==2CO2(g)+4H2O(l);△H=-22.68kJ·mol-1

D.CH4O(l)+3/2O2(g)==CO2(g)+2H2O(g);△H=-725.8kJ·mol-1

题型:问答题

将现金存入银行,登记银行存款日记账的依据是( )。

A.现金付款凭证
B.现金收款凭证
C.银行存款付款凭证
D.银行存款收款凭证

题型:问答题

以下哪个是DRCLockLength的可取值()

A.4次

B.8次

C.16次

D.32次

E.64次

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