胚外中胚层发育成什么

黄河唯一穿过的省会城市是哪个 跪求黄河流经省区及其简称和省会城市~~~~~~~~~~~··急~~~~~~~~~~好的加分~~~~~~~~~~~ 黄河唯一穿城而过的省会城市 at present most young people like pop music because the song sound melody words of song isapropos our life sometimes reaction our voice .能不能帮我改改语法错误~ The hungry bird likes nice big frogs改为一般疑问句 ()the bungry duck like nice big fishes?写出括号里正确的单词提示(do) 选出不同类的一项.A.like B.small C.big D.nice 一项工程,两对何琇每天完成全工程的40分之9,甲独做3天,乙独做5天后,还剩全工程的8分之1未完成,求乙独修这项工程学要多少天? 祖冲之圆周率算到第七位有什么用,表示很疑惑. 世界上第一位把圆周率计算到第七位的是? I like ____kites in spring 存在异方差下,参数的OLS估计的方差增大,为什么又说OLS估计低估了... by far 与so far作为到目前为止的意思的区别 Are you ____different countries?Yes,we are. I like big hats.变否定句 I （）（）big hats ____sharpener do you like,the purple one or brown one? l have an old one like a panda and another one like a big fish.这句话哪里有错? 把圆周率精确到第六位的是谁一定要第六位 中国第一个把圆周率精确到7位的是谁 圆周率精确到第六位的是谁 圆周率谁最早精确7位 pre container He was waiting a chance to prove of himself but things go contrary to one's wishes,[句子错误] 主谓不一致,建议将he后的谓语动词改为第三人称单数.怎么修改啊 Things, ___ is often the case, will turn out to be contrary to one's wishes.A. as B. which C. that D. itWhich one? Why? If things go contrary to my wishes,wish me a future life with you.的中文是什么?明天交货! things to come ,things to go things to come,things to 请问北京有沙漠吗? 假如北京成了沙漠,我的生活会是什么样子 北京的沙漠每年前进多少? 高一的团支书怎么当,有什么要做的,急快 高一团支书的任务有哪些?