咬定青山不放松立根原在破岩中

请知道的人帮忙解答下.第19题, 求昼夜交替现象原因因为地球是不透明、自身不发光的球体,且在自转【但是地球只公转不自转也能产生昼夜交替现象 如图所示的装置中AO=BC=40cm OC=30cm 在A处悬挂50N重物时 在B处至少应加多少牛的力 才能使装置处于平衡状态,做出这个力. 我从老师那里考来了英语课件,听力就在里面,不是那种通过连接的,要怎么做才能将听力从课件里分离出来呢 likes my math friend much very 组成一句话 将长40cm,高30cm,重100N的物体推倒,至少需要多大的力 求英语课件我要关于中西方节日的英语课件,其他话题也行．适合大学英语．要做的细致,有急用 i _____(catch)insects Insects的中文 catch insects是什么意思 新标准英语的一年级下册 Out与outside的区别, out 和outside的区别,最好有例句. out 和outside 区别She is outside| out 谁对?为什么啊 The boy in the brown hat likes summer变特殊疑问句 积极的对待生活 英文如题 My mother likes work a lot.怎么解释 My mother likes _____(they) a lot.用所给单词的适当形式填空急答得好另加分 My mother likes sleeping______(a lot ,a lot of)on weekeng. I want to do sth Say to sb 的意思 My mother can cook.My father can paint the wall.(合并） i want my mother cook dinner for me cook 要不要加S 为什么?Thanks a lot! You get out what you put in You get out of them what you put in.怎么翻译啊? if you get 可以连读? drop变过去分词时为什么双写?后面也没有重读啊? You speak very good English (课本上的原话)可以不可以说成,You speak English very good第二句算不算对,有没有语法错误 her___(speak) English is good A were was B are was C we're is 是选mouth还是nose还是eyes还是face? 请问we were 可以写成we're;he was可以写成he's吗? I think he doesn't know the woman.同义句转换,改成___ ____ ____,he doesn't know the woman