已知抛物线①经过点A（-1,0）、B（4,5）、C（0,-3），其对称轴与直线BC交于点P。 （1）求抛物线①的表达式及点P的坐标； （2）将抛物线①向右平移1个单
汽车尾气排放出的气体主要有NO和NO2,它们污染环境,可用氨气(NH3)除去。 反应的化学方程式为:2NH3 + NO + NO2催化剂 2N2 +3H2O。若反应后得到56g N2,理论 上消耗
My name is Bill. I have a friend called Mike. Today is Mike's birthday. I'm at his birthday party. There are a lot of friends in his house. Some stand beside the table and enjoy the snacks a
今年寒假你们都过得怎样? 相信一定很精彩, 请先把下面的题目补充完整, 然后描述自己的一天 ,80词左右. (可填的词如happy, busy, unforgettable, 等等)
His father feels like ________a walk after dinner while his mother would like ______TV at home. A. taking; watching B. to take; to watch C. taking; to watch D. to take; watching
下列关于种群、群落和生态系统的描述，错误的是（ ） A．种群密度是种群最基本的数量特征 B．原来存在过植被的地方只能出现次生演替 C．蜜蜂跳舞
阅读下列材料，并解答问题： 材料一：乘积为1的两个数互为倒数，如和，即若设a:b=x，则； 材料二：分配律：(a+b)c=ac+bc； 利用上述材料，请用简便方
Can you tell me in the future? A. what are you going to be B. what you are C. what you are going to be D. what were you
