【简答题】已知:如图,抛物线y=ax 2 +bx+c的顶点为C(1,0),且与直线l:y=x+m交y轴于同一点B(0,1),与直线l交于另一点A,D为抛物线的对称轴与直线l的交点,P为线段AB上的一动点(不与点A、B重合),过点P作y轴的平行线交抛物线于点E. (1)求抛物线和直线l的函数解析式,及另一交点A的坐标; (2)求△ABE的最大面积是多少? (3)问是否存在这样的点P,使四边形PECD为平行四边...
【简答题】Alexi s Vaughan,17,sat tiredly in the passenger seat of her dad’s car.The early Saturday morning run with her father,Michael,was part of the punishment.She stared sadly out of the window at the cornfi...
【简答题】Two______(month)ago,three_____(Negro), who were all______(hero), caught four_____(thief)because they had stolen some_____(potato)and some bamboos from 2_____(zoo), where 500_____(sheep),200_____(deer)...
【单选题】Need a Ride??? Take the Bus! Parsons Holiday Tours Ltd. A five day package—March 6th—10th, 200The tour includes Motorcoach transportation, 4 nights accommodation, Weekend admission to the Cowboy Festi...
【单选题】根据《原发性骨质疏松症诊治指南》下列关于预防骨质疏松症之“骨健康基本补充剂”的说法,不正确的是
A.
按我国营养学会标准,成人每日元素钙摄入量800mg
B.
绝经女性和老年人每日钙推荐摄入量1000mg
C.
目前老年人平均每日从饮食中获得元素钙400mg,每日应该额外补充500-600mg钙
D.
有证据表明单纯补钙可替代其它抗骨质疏松药物治疗
【简答题】如图,在直角坐标系 xOy 中,点 A 在 x 轴的正半轴上,点 B 在 y 轴的正半轴上, 以 OB 为直径的⊙ C 与 AB 交于点 D , DE 与⊙ C 相切交 x 轴于点 E , 且 OA = cm,∠ OAB ='30°.' (1)求点 B 的坐标及直线 AB 的解析式; (2)过点 B 作 BG ^ EC 于 F , 交 x 轴于点 G , 求 BD 的长及点 F 的坐标; (3)设...
【简答题】如图,在平面直角坐标系中,已知点A(0,16),D(24,0),点B在第一象限,且AB ∥ x轴,BD=20,动点P从原点O开始沿y轴正半轴以每秒4个单位长的速度向点A匀速运动,过点P作x轴的平行线与BD交于点C;动点Q从点A开始沿线段AB-BD以每秒8个单位长的速度向点D匀速运动,设点P、Q同时开始运动且时间为t(t>0),当点P与点A重合时停止运动, 点Q也随之停止运动. (1)求点B的坐标及...
【单选题】FOREST FIRES, TRI-COUNTY AREA JUNE 2005 NUMBER OF PROBABLE DATE AREA ACRES BURNED CAUSE June 2 Burgaw Grove 115 Lightning June 3 Fenner Forest 200 Campfire June 7 Voorhees Air Base Training Site 400 E...
A.
A group of rowdy teenagers tossed a match into a tent.
B.
A deer hunter lighting a cigarette acciden tally tossed a match too close to a dry shrub.
C.
An inexperienced camper filled a camp stove with gasoline and it exploded.
D.
Lightning struck a tree in the forest.
【判断题】古代的书法名家,往往有着较高的社会地位和身份。
【单选题】下列有关药物经济学评价指标表述不准确的是()。