问一道空间几何题

相关推荐

• 立体几何两道概念题?空间四点中三点共线是四点共面的什么条件?空间四点中三点共线是四点共面的什么条件?一直线和直线外不共线三点确定的平面数可以是?
• 问一道SAT的写作题has the emphasis on individualism in our society caused people to forget the importance of belonging to a community.请提供思路
• 一道较难的数学题,急.某中学计划建设一个400m跑道的运动场(如下图所示),聘请你任工程师,问：(1)若直道长100m,则弯道弧长半径r为多少m?(2)共8个跑道,每条宽1.2m,操场最外圈长多少m?(3)若操场中心铺绿草,跑道铺塑胶,则各需绿草、塑胶多少㎡?(4)若绿草50元/㎡,塑胶350元/㎡,学校现有200万元,可以开工吗?为什么?对不起,没有图.
• 问一道关于正反比例的判断题1.一个人的年龄和身高.2.圆锥的体积和地面积.3.用铜制成的零件的体积和质量.希望说的详细一点,（说得好才给分
• 问一道高一数学空间几何题(急!+)在正方形ABCD-A'B'C'D'中,E.F是棱CD,BC的中点,O是底面A'B'C'D'的中心,那么直线EF与平面CC'O垂直吗?请说明理由.
• 问一道SAT写作题which is the best way to combine these two sentences below?In royal palaces there were to be found many comforts that medieval castles did not offer.These had dark dungeons and many more comforts than could be found threr.有三个选项我都觉得可以.1) While medieval castles offered only dark dungeons and damp,drafty living quarters,many comforts were to be found in royal palaces.2) Unlike medieval castles,royal palaces offered many comforts not found in dar
• 一道数学题有一个班,男生占全部的九分之六,女生占全部人的九分之三,问男生比女生多几分之几?急!1
• 问一道很简单的英文应用题An insurance salesperson,who sold 260 policies last year,has averaged 4 policies per week for the first 8 months of this year.How many policies per week must he average in the remaining weeks in order to equal his performance for last year?由于告诉的是前8个月,而问又是星期为单位,每个月几个星期又不固定,怎么换算能够达到最高效率?
• 问一道很简单的应用题甲乙两地相距240千米,一辆汽车从甲地开往乙地需要4小时,返回时用了6小时,问这辆汽车往返的平均速度是多少?（列式计算）
• 问一道数学题,谁能帮我下啊!一块长方形木板长8分米,如果把它锯成一块最大的正方形木板,这块木板的面积是原来的百分之几?比原来的面积减少百分之几?
• This is nice,but too expensive.Could you make it 30 yuan?怎么回答
• then he (said) a story which went on for a long time.