热能转化为机械能

六年级人教版练习册42、43页第5题答案,快,一道图形题，我是替我弟问的。人教版的哦！42页最后那个第五题。 青春有什么值得珍惜的?青春时期、并不快乐. -------- what was happening at that time,the man called the policeA See B seeing C TO See D saw 选什么,为什么 The man hurried there to see what was happening还是what has happened both men had hardly had time to realize what was happening when they were thrown violently into the sea中had hardly had time中had分别是什么意思?我知道hardly had time是几乎没时间的意思,那么前一个had是什么意思呢?谢谢 ____ what to do,the man telephoned the police.(4 分)A.Not knownB.Don’t knowC.Not knowingD.knowing not选哪个? 世界上淡水储量最大的湖是 it is the third time that she has won the race ,_____has surprised us at all为什么要用which而不是that?是因为它是非限定性定语从句么? 设x=根号(5+根号5）...二次根式数学题】 ＿__seems to be no possibility ___LiHua can win the first prize in the 100-meter race A It;that B There ; that Cthere;whether D It;whether 为什么选B you can not finish the race if you rest all the time It was a___race.It seemed that all the swimmers had finished at the same timeA.close B.closed C.closing D.to close 地球的陆地面积有多大 祖国60周年取得了那些经济成就? 那个年轻人有时开车兜风 That young man _____ ____ a drive ____ 1.那个年轻人有时开车兜风.That young man ____ ____ a drive ___.2.My father always watches Animal World ,because he is interesting in animals.(改错）A:watches B:because C:interesting D:in 一千克奶糖和一千克酥糖共25.8元,同样的8千克奶糖的8千克酥糖共多少元 万用表倍率选择的原则? 用指针式万用表检测有无电容器时要选择什么倍率的欧姆档 用万用表的电阻档检测“2200微法,25伏”的电容器质量时,选择的倍率是多少? 万用表测电阻的倍率是精确值吗 帮我写读后感~要长一点的..帮我写 悬赏分很高、写得好的、我另外加分..还有 不要说什么自己写之类的我要自己写就不找你们了...我不喜欢春季的稚嫩,不喜欢夏季的火热,也不喜欢冬季的单 七年级英语演讲稿不要太长,要原创的!一定要七年级的,不要太难! 怎样才能把读后感写长要真正有用的回答 七年级英语演讲稿,别太难!谢谢同志们了!急求! 怎样写观后感的方法 英语口语演讲稿（七年级）求一篇七年级的英语口语演讲稿,也就是自我介绍,符合水平就行.急~~~~~对了，要再想下翻译，:^_^ 求英语演讲稿,新目标七年级上水平,要翻译!别太难不要太难，也不要太长~！ 求七年级英语新目标演讲稿,简单的,急啊! 一米有几英尺?一千克有 几磅? 我今年15岁.我一米六五用英语怎么说 快 1米的十分之七是十分之七,还可以写成( )米 快看