二阶偏导连续的条件

有什么办法能迅速提高英语水平? What's the time for things to give up.What's the time for the things to finish是什么意思.那如果是感情方面的,关于现在的心情,是代表着什么呢? 你可以看到远处的山连绵起伏,用英语怎么说 在远处,在远方,用英语怎么说 从远处看地球是蓝色的英语怎么说 film和movie有区别吗,区别在哪? 能做电铸铭牌的求介绍! 找家公司做电铸铭牌的.求介绍! i just help out with chores around the 求一首粤语和英语的混搭歌曲,先是女生唱的英文然后男生开始唱,曲子有点像迪曲的电子音乐,男生以rap为主 英语翻译他将什么时候去国外工作?他明年将去国外工作.舞会什么时候开始?他将在7点开始并持续3小时今天晚上有音乐会吗?是的,有下周全国将会有暴雨,并吹起西南风 If you keep on,you will succeed ____ time.请问划线处应该填写哪个介词,是IN还是ON If you keep on,you will s____ in time.填空 Christmas is a time of joy.We will keep you posted on our progress every step of the waya time of 是什么用法啊 .下一句有什么词组要注意啊 I will keep you company all the time. 电影的英语是film还是movie?说明哪个是英国,哪个是美国! 美国人习惯“电影”说film还是movie?经常看香港的英文电视台,报新闻的最后一句总是好像说the news roundup is after the moive(好像那句话是这样说,说得比较快,不知道是不是这句）或者是the news roundu 电影的英文是“film”还是“movie”,还是两个都行? 我正在看电影 movie/ film 前要不要加a / the I am watching a/the movie / film His parents make him ____ much time _____.A .take ; to studyB .spend ; studying I'll eat a piece of cake to until dinner time A.keep me going B make me fill C letting me fullD feel hungryA.是啥意思啊？ Now it's time for me to--thanks to my parentsA.takeB.feedC.getD.show 6 7 8题 5,6,7,8题 6,7,8题应该填什么? Tom's mother often requires that he ______ more time in studying English eveTom's mother often requires that he ______ more time in studying English every day.A.spend B.spends C.spending D.spent why did Mrs.Mills ask the way to the man?的意思 can ask the policeman the way,mrs.mills saida、to herself b、to himself c、to oneself d、to hisself why not ask the man over there?改为同义句 why ___ ___ask the man over there? Why not ask the man over there(同义) ______ _______asking the man over there 到底有没有“find sb do sth” 有没有find sb do sth这个短语?find sb doing 和他有什么区别?