2 4 B、 1 2 C、 2 2 D、 3 2 试题答案 在线课程 考点:椭圆的简单性质 专题:计算题,圆锥曲线的定义、性质与方程 分析:确定几何量,即可得到椭圆的离心率. 解答: x2 4 y2 2 c a 点评:本题考查椭圆的方程,考查椭圆的几何性质,确定几何量是关键. ...
PROBLEM TO BE SOLVED: To simplify attaching and detaching work and the discharge work of water accumulated inside a tank by freely engageably and disengageably fixing a shower hose tank to a locking tool attached to the back plate of a cabinet main body. ;SOLUTION: A potbellied hole 27 for...