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请问这是什么杠杆?画出它的五要素上面一个图是什么杠杆?这个是预习作业,是省力杠杆还是费力杠杆或等臂杠杆?能否烦劳一下帮我标出它的力臂、动力、阻力、支点呢?还有下面一个,求指导, 古今中外,有许多珍惜时间的名警句,你来写两句. 可乐放在冷藏室里要多少时间,才能变成冰沙 苦大萨伊是什么意思 欧亚丝米那萨伊 什么意思 七巧板有几种图形组成 七巧板可分为哪几种图形? 七巧板是由哪7个图形组成的? 七巧板是由什么图形组成的就只有一种图形,忘和大家说了 七巧板由几种图形组成? 可乐冰沙会不会爆炸 凯恩斯定律的具体内容是什么?我的西方经济学书中关于凯恩斯定律的内容很笼统, 什么是凯恩斯定律? 凯恩斯三大基本定律是什么? t和st中间该填什么（英语） 两句有关珍惜时间的格言 抛物线顶点坐标为点C(1,4),交x轴于点A(3,0),交y轴于点B 点Q（X,0)是X轴正半轴上的一动点过Q点作X轴的垂线,交抛物线于点P,交直线BA于D点,连接OD,PB.(1),当点Q(X,O)在X轴正半轴上运动时,四边形OBPD能否 w( ) ( )t 括号里填什么 至少有三年的英语基础,"The students have a three-year English basics at least." 这个句子对吗? 至少有三年的英语基础,"The students have three-year English basic at least." 这个句子对吗? where are you u now 求高手指点下面的四种表达：3-hour work;3-hour's work;three hours' work;three hours of work希望有高手加以详解,尤其是第一种与第二种.在下感激不尽! John stopped____a rest(have)a rest because he____for three hours(work)完形填空要说明理由 where are you now 的中文歌词Honor Society - Where Are You NowTo my favorite teacherTold me never give upTo my fifth grade crushWho I thought I really lovedTo the the guys I missAnd the girls we kissedWhere are you now?To my ex best friendsDon't 可乐怎么变冰沙 ( )d( )( )n括号里可以填什么 d( )( )rbell括号里填什么 d( )( )( )( )( )( )括号中填英文 He had been out of work for eight months,However,things started to _after he got another job.A.look on B,look out C,look back D.look up 请翻译We were moving to a new state after my husband had been out of work for many months and we had How′s your father been?He′s been out of work for a couple of days.上面两句中,′s是指什么?是has还是is啊?而后面的been又起什么作用?这两句是什么时态啊? Where are you now?怎么回答