【简答题】若∫ 0 1 dx∫ x 2 x 3 f(x,y)dy=∫ 0 1 dy∫ x 1 (y) x 2 (y) f(x,y)dx 则 (x 1 (y),x 2 (y))=______
【单选题】文法G:S → xS | y 所识别的语言是( )。
【单选题】文法G:S → xS | y 所识别的语言是( )。
【单选题】It's necessary that an arbitration clause ______ in the contract.
【简答题】若∫ -1 0 dx∫ 0 1+x f(x,y)dy+∫ 0 1 dx∫ 0 1-x f(x,y)dy =∫ 0 1 dy∫ x 1 (y) x 2 (y) f(x,y)dx (x 1 (y),x 2 (y))=______
【简答题】比较大小:∫ 0 1 x 2 dx______∫ 0 1 x 3 dx
【简答题】已知I 1 =∫ 0 1 x 2 dx,I 2 =∫ 0 1 x 3 dx,则I 1 ______I 2 (填“>”“<”“=”)。
【单选题】It's necessary that everyone his homework by the end of this week.
【多选题】下列关于组织学与胚胎学的地位和作用描述正确的是