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1.There (D) a dirty river here,but now it has become quite clean.A.would be B.ought to be C.has been D.used to be【为什么不选A?】2.What he said has us (A) all night.A.laughing B.to laugh C.laugh D.laughed【为什么不选C?】关于第一题 when is the library open?还是opening 请帮我分析几题英语语法题~At last we were able to ------him to take our advice.(d)A．suggest B．advise C．insist D．persuadeThe girl studies hard,so she is------ to succeed in the examination.(c)A．hoped B．liked C．expected D．tho 难到爆的英语语法（初三） 写理由I _____ my mother bend down by one of bunchesA.watched B.saw C.looked 初三超难英语语法1.There are tall buildings on ___ side of the playground.A.every B.each 100米跑步测试,如何发挥最佳水平. calculus,use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about y-axis,y=2+x-x^2, x + y =2V=( ? ) F(x+y) = F(x) + F(y) + x^2 *y + x* y^2for all real numbers x and y and ,lim x->0 F(x)/x = 1 求F'(x) = F‘（X） = 1 .作业最后一题了..暗示:F'(x) = lim h->0 F(x+h) - f(x) / h等式就变成 F(x+y) - F(x) = F(y) + x^2y + xy^2 我是一大学生,上学期挂科了,最近就要补考.老师透了几道题.临时抱佛脚,我背下来,请不要教育我说要自己好好学习,因为我是学英语的,数学做的再好也没有作用.知道这些题目对高手来说只是 when you find the love,it will open your eyes to all the beauty around you.同学问我的 必须在11月下旬完成 首字母when you laugh,you will o_ your mouth and show your teeth,the healthier those teeth are,the happier you look,why is that?it is because your teeth are important in many w_ .if you take care of them,they'll heip to take care of you,strong heal When will you (c ) your mistakes?填词My teacher tells me to write new words in (g ).Best (w ) to you.填一下括号中的单词 when you open your eyes. 超难英语语法Is ____ here today?A.everyone B.every one 老师说要写运动会宣传稿,要200字以上的,不是演讲稿,是宣传稿,有好多人写成演讲稿了!急用,要写得好,我要评奖,. 物理题一道（偶怎么求都和答案不一样）金贸大厦内有高速电梯,设电梯从地面到顶楼实际运行高度为410m,最大速度为13.9m/s,向上加速度为1.8m/s^2,向下加速度为0.6m/s^2,1）参观者从地面到顶楼,需 瓦利斯公式,书上只给出了sinx的n次方积分的公式,我不知道证明的过程所以对cosx的n次方公式形式是否与sin一样很怀疑啊,做题时不敢下手了.谁能给我一个最终结果?确定的.对不起我现在只剩15 各位擅长微积分的牛人们,帮帮我吧!(f'(t)+1)*f(t)=5 f(0)=1 求f(t)？？？？？？？？拜托啦 ⑴ 2∫（下限是0,上限是正无穷大）*2x*e的（-2x）次方dx+3∫（下限是0,上限是正无穷大）*3x*e的（-3x）次方dx ⑵ ∫（下限是0,上限是2）dx*∫（下限是0,上限是2）*8分之1*xy*（x+y）*dy⑶ ∫（下限 《梅花》 王安石 赏析具体点 王安石《梅花》这是诗是什么意思 怎样用牛顿环来测量单色光波波长 怎么样用牛顿环测量单色光波的波长 英语选择题was it——it snowed last night——he didn't come?A,because；when .B,why...英语选择题was it——it snowed last night——he didn't come?A,because；when .B,why；that .C,that；because .Dbecause；that 如图,AD是角ABC的外角平分线,角B=30°,角DAE=65°则角ACD等于多少度 王安石《梅花》 王安石《梅花》内容 when it后面用什么时态请说一下为什么使用一般时态,when意思是 当xxxxx时,那不应该将来时吗? when后可加什么时态 王安石在梅花中用 “____________,____________.”来描绘它;它是梅花! 第十题求讲解 It's 9 o'clock sharp .