It's mine 后面为什么用mine

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• 1、登一座山,上山时每分钟行50米,到山顶后沿原路下山每分钟行90米,若上山所需时间比下山多400分钟,则这条山路有多少千米?2、甲、乙两人从A地出发,如果甲先走1消失,乙从后面追赶X小时后,刚好在B地追上甲,则甲走了多少小时?若甲的速度是6千米/时,乙的速度是8千米/时,则可列出的方程是_________?（用方程解答）3、轮船在两码头之间航行,顺水速度为a千米/时,逆水速度为b千米/时,则水流速度是多少千米/时?4、汽车以每小时72km的速度笔直的开向寂静的山谷,驾驶员按一声喇叭,4s后听到回想,已知声音在空气中的传播速度是340m/s,听到回响时汽车离山谷的距离是多少米?不懂。请用方程解答
• 1、在水平直轨道上有两辆长为l的汽车,中心相距为s,开始时,A车在后面以初速度大小为v0、加速度大小为2a正对着B车做匀减速直线运动,而B车同时以初速度为零、加速度大小为a做匀减速直线运动,两车运动方向相同,要使两车不相撞,则v0应满足的关系式是什么?2、特快车甲以速率v1行驶,司机突然发现在正前方距甲车s处有列车乙正以速率为v2（v2小于v1）向同一方向运动.为使甲、乙两车不相撞,司机立即使甲车以加速度a做匀减速运动,而乙车仍做原来的速度匀速运动.求a的大小应满足的条件.
• 关于几道英语句子结构的题目A .S+V B.S+V+DO C.S+V+DO+OC D.S+V+IO+DO E.S+V+P 1 .Andy is planning to go out _______2.Playing football is interesting _______3.He is running ______4.The book on the desk is mine______5.He gave me a book _______6.Some colours make us feel calm_____
• 解释一个VOA的句子The French government had been supplying the Americans secretly through the work of America's minster to France,Benjamin Franklin.疑问在于throgh……后面如何理解?我理解成是法国通过本杰明来输送供给帮助.minster to意思为援助、而minster意思为首长?如何理解后半句?
• it's impossible that one person doesn't make any (mistakes)all his life.为什么用复数啊?any当任何讲的时候后面不是跟可数名词单数么?要中考了 这一直没弄明白 求正确详解~还有一个类似的 the twin brothers look the same .i can't find any (differences)between them.
• That iPod is mine.（改为同义句） That's _____ _____ iPod.
• 英语填介词,副词或连词1:It's much faster_____having lessons.2:I got the best scores_____our class last week.3:Who is the tallest_____the boys?4:How much do you spend_____the new bike?5:My watch is different________yours.6:Life of America isn't the same______that______England.7:This pair_____shoes looks ______mine.8:Don't worry.I can help you _____your maths.
• 单项选择 1.the weather in guangzhou is hotter than ( ) in shenyang.A that B It C this D one2.（ ）have a racing bicycle.A .Each B .Each of us C .Every of us D.We each3.My bike is broken.May I borrow（ A .you B.yourself C.yours D.your4.I bought（ ） exercise books with（ ）money.A.a few;a few B.a few;a littleC.a little;a few D.a little; a little5.（ ） is he?He is a bus driver.A.Who B.Which C.That D .What6.（ ）hat is this?It's （ ）.A.Whose；me B.Who;mine C.Whom ;his D
• Do you need( )help except mine?A.someone else B.some one else's C.anyone else D.anyone else's
• 给下列句子重新排序 （）Where's mine?Can you find it?（）No,it isn't.（）Is it on the bed?未完
• Let me( ) .oh,it's mine.
• 启动直流电动机前,电枢回路调节电阻RPa和励磁回路调节电阻RPf的阻值应分别调到什么位置?