课堂教学提问的有效性

s=t2*f(sin(t)),求s' （求导） we went in to the hotel but ididnot have my backpack 变一般疑问句 一道高等数学题的求解求解下面的题 jojo too little too late 中文歌词 找一首歌 too little late 第一 不是 JOJO的 第二部是brandy 的 ,R 只有一个TOO 没有2个 ,男的唱的不是 是 too little late 也不是 Default 的 you的物主代词怎么读 Jane is ------(care) enough to do everything well. 根据提示写句子 He is very c--- and he believes he can do everything well. Mr Smith is a careless man.He can do everything well.改错. you物主代词 I heard your monther____ill yesterday.how____she now?A were;wasB was;isC are;wasD are;are Many people have married whose chances to do so were much inferior to Miss Martha's.Many people have married whose chances to do so were much inferior to Miss Martha's.这句话to do 怎么回事?,so were much 已知无穷等比数列An的前n项和为Sn,若limSn（n到正无穷）的极限=1/4,则其首项A1的取值范围是多少 英语翻译就是用worry 的ed和ing形势造句 若一个无穷等比数列an的前n项和为sn ,limsn=1/2,则首项的取值范围? 【200分悬赏】一道旋转体体积的问题,高等数学（一）关于旋转体 体积的一道题求y=x^2 y=x^1/2 ↑ ↑（y=x的平方） （y=x开根号）这两个函数,绕y轴旋转所形成的体积 ★★★我的问题：从函数图 There is nothing to do with me 是什么意思 Laughter is just a look.Nothing to do with the mood His work has ___ his health.The doctor suggests that he travel to the beach to have a holiday.1.affected 2.effected 3.caused 4.brought the doctor was p___when he heard that,and went away quite happily 优美风景段落(100字以上)一字儿! 设无穷等比数列{an}的前n项和为Sn,首项是a1,若limSn=a1^2,a1∈(1,4)则公比q的取值范围是? 1.等比数列｛an｝的公比为-1/2,前n项和Sn满足limSn=1/a1,那么a1的值为?2.在等比数列｛an｝中,a1>1,且前n项和Sn满足limSn=1/a1,那么a1的取值范围是? 关于春天 的好段100字多几个段落 长城的作文350个字 度字加偏旁部首度 加偏旁部首能怎么加?我想了2个 渡 踱 急:"类"字可以做偏旁吗?有的话能构成什么字?并组词. 非淡泊无以明志 非宁静无以致远 英文翻译 暑假中有趣的一件事写一篇作文.要求写出你去了哪里,参观了什么,是否开心等.注意时态正确,词数60左右. Dogs guard our homes and keep people_______ danger.A.in B.for C.away D.from 作文不用. 用（ ）里的适当形式填空在【 】里 Dogs are [ ] (help) to our homes.