什么是机械运动

现在中国几大油田呢 我国第二大油田 方程x*x+y*y=n,x和y是未知数,n是给定的正整数,问（x,y）的正整数解的组数.注：（1,3）和（3,1）是两组解.1.我希望的答案是关于n的函数，并请您证明结论。(这是刚刚加上的，因为自己说的不清 对与非0自然数a b 规定a%b=a除于b乘2加3 且256%a=19 是几 通常的闹钟上都有60个表示分钟的标记,在0点至12点这12小时内,如果时针和分针指向两个相邻标记,那么应该是几点几分? have to be home 和 have to get home的区别十点之前必须到家是have to be home by 10 o'clock还是have to get home by 10 o'clock have to be home by 10 o'clock 为什么用by and i have to be in ____ by 10 pm I have to be home by 10:00pm.不应有at吗不应在home前加at吗?再说那我在家不是I'm at home. I will be allowed to have Monday ____ to go home用适当的介词或副词填(不好意思这题做不来, 中国第一个油田是什么油田? 小数报杯小小数学家考卷要历年决赛的 请教数学高手：已知月计划收入21万元,请问如何要根据一周不同收入比例,计算出日指标?例如8月份,周一至日比例分别为12%,11%,19%,11%,17%,10%,20%,周一至三分别为5天,周四至日分别为4天,怎样计算 两个单选题,英语,1.He gave me the phone number in order____contact him when we are in need of him when we are in need of help.A.to B .of me to C.for me to D.that I为什么选C呢?2.Is it any good_____ ______?A.to try; to explain B.to try; expl 帮我解答两个英语单选题!1.He like the painting very much ,which cost him $ 1,000.However ,he would gladly have paid twice as much for it .为什么选 c A.as much twice B.much as twice C.twice as much D.as twice much 2.I don’t deny that J 改错My father usually arrives at home at7：00 pmWhat a fine day Why not to go fishing with usWe walk through the bridge and have the meal under a big tree 两个英语单选题,1 --There are too many people in the museum during the National day--Yes,that is a serious threat to safety ___A___emergency.Ain case of B in defence of Cin need of D in search of2 Doctor Lin Qing ,___C___John turn to u for help 求问两道英语单选题,求详解,The man answered the phone in a loud voice at the meeting,made Andy annoyed．A．that B．what C．who D．whichI invited my parents to spend Christmas with us,but____of them came.A.none B.both C.either D.neithe 在m÷n=8……3中,把m、n同时扩大3倍,商是( ),余数是 英语习题帮助!好人来啊!``````````````````````一.句子改错.Four plus there are seven .(_________)改为 (_______)二.I like b________,because it's the color of sky and sea.An American r_________.Ballet is a kind of classical 同义句He is good soccerThere is a small garden before my houseThere is no car or bus in the parking lot ________fine the weather is.A.HowB.A howC.WhatD.A what Recently,many English teachers from universities all over China came together.They discussed h 86 to use newspapers to teach English.Wu Ping,a university professor,said that her university has b 87 a course on newspaper reading for freshman English m 亲爱的此生只想爱你英文翻译 我只想爱你一个人,英文翻译? 帮我解几道英语单选题1.-----Do you have to take care of your mother at home?----Yes.I______ A.do B.have to 为什么不是A,而是B?2.I shall______help him as much as possible.A.must B.have to 答案为什么是B?我感觉A也对.3.When a fr ---Are you going to the basketball game?---No.the tickets are___expensive for me.A.very muchB.highlyC.so muchD.far too请顺便解释下原因.(我选的B,不知怎么错了) ________?---I was watching TV at home.a. What were you doing when it rained.b. What were you doing while it was raining.c. What did you do while it was raining. 英语单选题求解(1) I know you've no acquaintances here yet.But ____ Mrs.Chambers called just now.A.the B./ C.a D.an为什么要选C?在人名前加a是什么用法?(2) If you ______ change your mind,please let us know.A.shall B.should C.will D. 补全 I e____ watching tv at home-What do you usually do at the weekend?-I e___________ watching tv at home. 在m÷n=8……3中,把m、n同时扩大3倍,商是( ),余数是( ). 某企业计划用两年的时间使产值增加44%,求每一年比前一年的增长率.一元二次方程应用题