Composition (I) for successive or simultaneous addition, comprises an isocyanate subcomposition comprising di-isocyanate monomers (5, (preferably 0.5)%) and monomers resulting from amino acid and comprising a content of isocyanate groups (equal to 55%); and at least a compound carrying dihydrocarby...
今天推荐的这款“STMJacketfor iPad”就是专门为iPad设计的便携“外套”了。外层使用坚固耐用的防水织物,内层使用高密度泡沫海棉,为iPad提供由内到外的保护;里料使用的是超软材质,不会划伤iPad;外部设有一个小口袋与一个拉链袋,方便收纳手机、数据线及其它小型数码设备;可作为内胆包使用,同时设计有手提柄,可单独携...
1)在三角形ABC中,点D,E,Q分别在AB,AC,BC上且DE平行于BC,AQ交DE于点P求证:DP/BQ=PE/QC (2)在三角形ABC中,∠BAC=90度,正方形DEFG的四个顶点在三角形ABC的边上,连接AG,AF分别交DE于M,N两点.1.若AB=AC=1,求出MN的长(要写过程!)2.求证MN²=DM*EN...