The miners were t____ underground. There was no way out!
代数式1x-1有意义时,字母x的取值范围是
若x、y为实数,且|x+2|+y-3=0,则求(x+y)2016的值.
如图,银边天竺葵在黑暗处放置一昼夜后,用黑圆纸片将B处从两面遮盖,光照几小时,摘下这片叶,经过酒精隔水加热后取出,滴加碘液.分析回答: