怎么判断左右导数存在

别人说enjoy your weekend怎么回答?每次拜五跟朋友再见的时候,朋友说enjoy your weekend该如何回答?（除了thanks,you too等这些基本的） Point 和Set of 3 propellers在仪器中是什么意思 ----- you enjoy your weekend 前面可以填什么 a set of point in line 为什么是enjoy your weekend而不是enjoying动词做主语不应该ing么 It is just so much fun in Disneyland!这句话的fun和前面的so much 有关系吗fun是可数名词还是不可数名词 It is just so much fun in Disneyland改为感叹句 it's just so much fun in disneyland这句话中的just是什么意思 赛末点 MATCH POINT怎么样 英语翻译 The king family i____ us to dinner填空 It is just so much fun in Disneyland中is能不能换成has,如果不能,为什么 The username chosen is already being used. The king family ____(be) from New York用IS 还是ARE 说明下 the smith family come from england.(同义句）the smith family____ ____ 因为是女人歌词译音 要中文 英语翻译if f'(x) is not zero,the point is a non-stationary point of inflection.如何翻译? 英语翻译我记着be set 好像是以...为背景的意思,记不太清了 在星期六的晚上我熬夜了英语翻译. 求一篇关于my favourite career的大学英语作文 伊朗以前有那些名字?尽量全一些 这日本名字 中文译音叫什么 呃呃呃呃呃呃 One of the boys suggested ____ and we were happy about this.A.go camping B.going campingC.to go camping D.go for camping 我的名字带个霞跟红 起什么英文名最好我姓陈 性格偏外向请根据我的名字跟性格起英文名 完全不理解权志龙 GD的歌she's gone 和krean dream怎么残害青少年了,求解释 我叫马子文,请给我取一个英文名, Are you sure they will come back___?正确答案是A为什么?A.before long B.long before C.after some time D.after sometime Please correct the format of your 在she is a beautiful girl.中表语是什么、宾语是什么? Please type your email address as shown She is the nice girl如果用the nice girl做主语,后半句是is she还是is her?用宾格儿做表语吧.