敕勒歌古诗的意思

They left home two days ago without telling about theWhen they saw their parA hunter saved two boys yesterday from a faraway mountain. They were trapped because they broke their legs. They left home two days ago without telling about their parents 若一个数的平方是2,则这个数是?若一个数有两个平方根,则这个数是?若m-4没有平方根,则m的取值范围? 萘系减水剂中里面成分有萘磺酸钠甲醛聚合物,硫酸钠成分含量如何测定,主要是萘磺酸钠甲醛聚合物的含量萘磺化过程中的酸度如何测定？ 为什么1-萘甲醛是液体,而2-萘甲醛是固体?它两仅羟基的位子不同,是同分异构体,均有亲水基羟基 paid in advance in quarterly instalments是什么意思及反义词 英语翻译this pant has a top loading knee pad insert,with flap closure 英语翻译服装材质前面加heavy和light,分别怎么翻译,例如：heavy jersey.另外,这个jersey做材质讲,是什么? 英语翻译all stitching & bar tacks in Dye To Match color 6m+3总有平方根,m的取值范围 已知函数f(x)=sin^2(x/2+π/12)+√3sin(x/2+π/12)*cos(x/2+π/12)-1/2在三角形ABC中,若sinC=2sinA,B为锐角且有f(B)=√3/2,求角A,B,C若f(x)(x>0)的图像与直线y=1/2交点的横坐标由小到大依次是x1,2x,,xn,求数列{xn}的前2 谁能帮帮我造句` 帮我造以下词博学多识 一拍即合 寻欢作乐 忘乎所以 义愤填膺 what is the world made up 已知abc为非零向量,t为实数则下列命题正确的是已知a,b,c为非零向量,t为实数,则下列命题正确的是 ( ) A.|a•b|=|a| |b| B.(a•b)•c=a•(b•c) C.ta•b=tb•ad.A•B=A•C〈﹦ You should try your best to remember____from this class A.nothing useful B.useful somethingC.useful everything D.everything useful what is it made of? 比亚迪汽车上的SECURITY是什么意思 汽车上security 键是什么意思 SECURITY在汽车上表示什么意思 You must touch your foot.改为祈使句 Helen did her homework just now.用tomorrow改写 汽车security是什么意思 英语security是什么意思 You must touch your head first.(改为祈使句） Let's begin.（改为同义词） 星期天迈克去踢足球了.（改为You must touch your head first.(改为祈使句）Let's begin.（改为同义词）星期天迈克去踢足球了.（改为 曲线y=2x方在点(1,2)处的切线斜率为 求曲线y=2x^2-1上一点P（1,1）处的切线的斜率 过曲线y=2x^2-1上一点p（1,1）处得切线的斜率是 You shouldn't be late again.的同义句 _____ _____ _____ again i shouldn't be late for the class again 改祈使句 you shouldn't be late to class again 改错 谁帮忙翻译下这句（I'm good ,good,good at…at nothing）详细点哦!可加分的! 请翻译Great enterprise comes from good health 直线x=y过圆x²+y²=1交点于PQ,求PQ的距离. shouldn't,loudly,speak,in,library,the,you怎么拼