小草的作用有哪些

A.B两地相距s千米,甲乙两人分别从两地同时出发,甲速x千米,乙速y千米（x大于y）答对有分拿!同向,已在前,甲在后,沿AB方向前进 ,则经过?小时后甲追上乙 （上面的问题）要理由 甲乙两人分别从相距s千米的AB 两地同时出发,若同向而行,则t小时后甲追上乙：若相向而行,则T小时后两人相遇,则甲速度与乙速度之比为（分式） 甲 乙两人同时骑自行车从相距S千米的两地同时出发,若同向而行,甲经过a小时追上乙,若相向而行,经过b小时两人相遇,设甲速为v1千米/小时,乙速为V2千米/小时,那么V1/V2=___ 军训总结怎么写啊要朴实一点的,不要语言太过华美的,能表现出高中生的心路历程就行 怎么写军训总结 What's happened to my Library books?___________A:I've no idea B:you bought them yesterday.C:you bought them yesterday D:They're about long life. 已知直线l被两条直线：3x+y-6=0和3x+y+3=0所截的线段长为3,且过点（1,0）,求直线l的方程 What a pity it is to find so many books with pages-----in our library!A missed B lose C losingD missing 选哪个,为什么这么选, 已知直线l被两平行直线3x+y-6=0和3x+y+3=0所截得的线段长为3,且直线过点（1,0）,求直线l的方程答案一定要详细 直线L过点A(1,O),且被两条平行直线3x+y-d=0和3x+y+3=O所截得的线段长为9,求直线L的方程. 已知直线l被两平行直线3x+y-6=0和3x+y+3=0所截得的线段长为3,且直线过点(1,0),求直线l方程 Mr Smith asked ____off because he didn't feel well.A.three day B.three days C.three days' D.three-day为什么答案是B,不是选D作形容词吗? 记到语文选择题 请求高人呢解答 实在搞不懂,望指教No one but her parents _______ about ita)knows b)know c)is knowing d)are knowing我的选择是B,"her parents"难道不是应用谓语的复数形式吗?是答案错了还是另有语法规则?望达人指教No one but...but 5/17X5/12X17 2（简便计算） 7/13+7/13X12 （简便计算） 大智慧的预警公式改为通信达的预警公式DYNAINFO(14)>-2% and DYNAINFO(14)2 andDYNAINFO(41)/DYNAINFO(43)>2 and DYNAINFO(48)/DYNAINFO(50)>2 and DYNAINFO(26)>1000and DYNAINFO(27)>1000 and DYNAINFO(41)>1000 and DYNAINFO(48)>1000; 6/17x5/13-5/17x6/13 简便计算 Don't talk loudly in public,_ _.(反意).谁告诉下 Don't talk loudly in the hallways.的汉译 department和section有什么区别?English departmentdepartment storewhat section will you be working in? DIVISION AND DEPARTMENT请问division 和department那个的范围大,有什么区别? buyer/purchaser/sourcer section/department/division这两组单词用法上的区别这两组单词在公司里用法有什么讲究的,所用的范围 八分之五比九分之五化简比是几比几? 八分之三：九分之四如何化简比?写出过程~~ 1又4分之1：八分之五（化简比） Don't talk and your friends in the library.改错 A SHORT HISTORY OF THE WORLD怎么样 quite a nice cup 还是 a quite nice cup 把0.128比八分之五化简. Division和departmen区别?都是部门的意思,哪个范围更大? A MONETARY HISTORY OF THE UNITED STATES 1867 1960怎么样