题目

如图（1）是某河上一座古拱桥的截面图，拱桥桥洞上沿是抛物线形状．抛物线两端点与水面的距离都是1m，拱桥的跨度为10cm．桥洞与水面的最大距离是5m．桥洞两侧壁上各有一盏距离水面4m的景观灯．现把拱桥的截面图放在平面直角坐标系中，如图（2）．求： （1） 抛物线的解析式； （2） 两盏景观灯P1、P2之间的水平距离．Shopping Guide in Central MallFloorsArticles6Restaurant /Coffee shop/ Tea house5Children’s pleasure ground/ Game center4Electrical equipment, clocks and watches/ Writing materials and office supplies3Men’s clothing /Bedding2Women’s clothing/ Children’s clothing1Fruit, vegetables, meat, eggs, drinks, cooked food, etc. /Kitchen wareBushiness hoursWeekdays:8:30am—6:30pmWeekends:9:00am—9:00pm【小题1】If you want to have a cup of coffee, you should go to the          floor.A．firstB．fourthC．fifthD．sixth【小题2】If you want to buy some apples and beef, you should go to the          floor.A．first B．secondC．thirdD．fourth【小题3】If Mr. Green wants to buy a shirt, he should go to the         floor.A．secondB．fourthC．thirdD．fifth【小题4】If Mrs. Green’s children want to play, they should go to the         floor.A．firstB．fourthC．fifthD．sixth【小题5】If you want to do some shopping in Central Mall in the evening, you may go there on        .A．WednesdayB．FridayC．SaturdayD．Monday