ph从7调至3硫酸用量

c(s)+o2(g)=co2(g) 熵增大还是减小我想不能由气体来判断吧 其中C是进入反应气体当中的 CO2(s)→CO2(g)熵变大于0?还有c(s)+o2(g)=co2(g) 熵变大于0还是小于0?不是两种状态的物质变为一种状态第一个CO2(s)→CO2(g)熵变大于0?还有第二个c(s)+o2(g)=co2(g) 第三个 s(s)+o2(g)=so2(g)熵变大于0还是小于0? 利用三角代换求下列函数的值域 S=x^2+xy+y^2(1小于等于x^2+y^2小于等于2） 当电阻一定时,导体中的电流跟电压成（ ）当电压不变时,导体中的电流跟电阻成（ ）分别填正比或者反比再告诉我正比和反比怎么看~ 物理和数学的正比和反比一样吗? 初一数学!每一题都写在纸上,完整过程 他说我命由我不由天.天要灭我,我猎天! 1.the boy（standing）in the teather's office was found(smoking) in the classroom yesterday2.i find tom is interested in English-yes,he never misses a chance(to practice)English with foreigners.不是没有miss to do sth的说法吗?.还有一个疑 I'm going to the mall.Mr Brown.Do you have angthing____?A.to be bought B.to buy C.bought D.to be boughtThe child ___3kg when he was born.A.weighed B.was weighed答案是A和C,我不懂为什么. 一块折弯的钣金,要计算它的展开尺寸,是用板厚的中心线长度吗?请教高手! 2008年9月23日到2011年3月12日一共是多少天? 概率论的题目,第3条, 我命由我不由天的前句是啥? ——Well,where did you spend your holiday last summer?——At______.A.where it is called Grand HotelB.which is called Grand HotelC.what is called Grand HotelD.that is called Grand Hotel 1.Reading cartoons and comic strips had long been a favourite pastime for adults (A)the beginning of the 20th century.A.until B.at C.before D.after2.The super-singing girl for 2006 is Shang Wenjie,( D) her teachers and classmates at Fudan University 如图,C是线段AB上的一点,三角形ACD和三角形BCE是等边三角形,AE交CD于M,BD交CE于N,交AE于O.求证：（1）角AOB=120度,（2）CM=CN,（3）MN平行AB. 1.If I ___(be)you,I ___(will do)it again.If I____(be)a bird,I___(will fly)in the sky.(看词填空)2.They would like to____(be away,leave)for two days.(选择)3.Pleae pass me the book,____most students like.Is this the book for___you are looking.(关 ( )31.He said he had been to Hong Kong ____ and he would go there _____ once again.A.long before,before long B.before long,long beforeC.long ago,before long D.long before,long before 概率论的6题,求详解 防滑坡道的斜面积怎么计算啊 室外无障碍坡道是否计算建筑面积? 英语翻译请高手帮忙翻译下The last octet in binary form is 00001110.Only 6 bits of this octet belong to the subnet mask.Hence,the subnetwork is 172.16.45.12. CCNA的题库,求翻译!Your ISP has given you the address 223.5.14.6/29 to assign to your router's interface. They have also given you the default gateway address of 223.5.14.7. After you have configured the address, the router is unable to ping any 如图,已知△ABC相似于△ACD,请写出两个三角形的对应边的比例式.请 快些回答啊 明天就开学了! 如图,已知△ABE≌△ACD,写出图中除这两个三角形的对应边,对应角意外其他相等的角和线段. 在三角形ABC中,∠A=∠B,∠C=80°,求∠A的度数 周末是指星期几? “周末”到底是指星期几?我要的是准确的答案…… 那请问到底星期天算不算? 星期天是星期几 是周6,还是周日. 英国的周末是星期几? 小周末指的是星期几?怎么有些人说星期五是小周末？ 作文 心愿