幽默的朋友作文六百字

一个有挑战性的问题(个人认为)..希望各位对化学有兴趣的同志一起研究下这个问题我在网络都找了好久了...都是一直找不到答案..可是 有人说 加入盐酸和氢氟酸可以把燃烧后纸的无机盐减 纯净的Ca(HCO3)2试样在高温下分解,当剩余的固体物质质量为原试样质量的一半时,Ca(HCO3)2的分解率是 （ ）A.50% B.75% C.92.7% D.100% 英语 英语 (13 19:4:12)There were some cakes ,after I had one,I had a(   )  They had a party "in Jim's grandparents' house" last Sunday.(对引号部分提问） They had a party in Jim's grandparent's house "last Sunday".(对引号部分提问） They had fun at the party last sunday的同义句They___ ____ ___ ____ at the party last sunday They had an English party last Sunday同义句 They had a party last year.(就 twice a month 提问) 描写玫瑰外貌的句子 描写玫瑰的样子的句子.急不要作用 求 中国十二生肖 的英文说法特别是 牛年 是不是 the Chinese ox year 求十二生肖的英文说法要正规的英文说法谢您 这里“when they come ”做句子的什么成分Each day is a holiday ,and ordinary holidays when they come are grudged as enforced interruptions in an absorbing vocation. 十二生肖的英文分别怎么写?要按照顺序哦 = = When do they come home? Do you know fish come of eggs when they are when did they go是什么意思求求哥哥姐姐们啦,我真的是走投无路了啊 求,此花儿叫啥名?最近北京大街上都是这个花儿,很漂亮,求名. 这花儿叫啥名买来名却忘了,求教达人 They had a good time last Sunday.改为一般疑问句 Last Sunday,they had a good time onlineLast Sunday,they had a good time （chat)onlineHis story made me feel (bore.)All the (visit)are interested in the old things in the museum.Which bag has (little)rice,the first,th they had a good time last sunday 改为感叹句 They had a good time last SundayThey had a good time last Sunday (改为同义句) 这个花叫什么名 这是什么花?求花名.这是什么花? 这花叫什么名字 请问这花叫什么名字 描写玫瑰花的句子 when did you go last Where did you go last sunday 意思翻译,还要说出回答! _did you go last sunday I went to Wudang mountains _bus .A.How;by B.Where,on C.When;by D.What;onA还是B Did you go boat last sunday?这句有什么问题