酸性高锰酸钾与盐酸

黄鼠狼和猫咬死的鸡能吃吗 I have a dog. I have a headache.看答句写问句 my mother is washing the dishes in the kitchen改为同义句 my mother is _ _ _in the kitchen My mother is washing dishes in the kitchen now.(对划线部分提问)(My mother 为 My mother is doing dishes in the kitchen.有什么错误 My mother are doing dishes in the kitchen.有什么错误 怎样把 I usually help my mother dry the dishes变成一般疑问句? 一学生用100N的力将质量为0.5kg的球以8m/s初速度沿水平方向提踢出20m远,则该学生对求做的功是 16J请给我详细的分析 谢谢 某人用100N的力把一个质量为4kg的铅球推到5m远的地方,他在推铅球时做的功是多少 There are twelve months in a year.对划线部分提问 划的是twelveI have a pair of sunglasses.(改为一般疑问句）Does she have a lunchbox?(作否定回答)They have some cameras.(改为否定句）Be quiet,please!(改为否定句）It's ti there are (twelve) months in a year.括号部分提问 A :how many months are there in a year?B:There are twelve .They are___ ____ ____ _____ _____ ____ 求对一种物品进行说明的英语作文! (1/2)在五米高处以十米每秒的速度水平抛出一小球,不计空气阻力,g取十米每秒,求;小球在空中运动的时...(1/2)在五米高处以十米每秒的速度水平抛出一小球,不计空气阻力,g取十米每秒,求;小球 在5米高处以10M/S的速度水品个抛出一小球,不计空气阻力,g取10M/S2,求1、小球在空中运动的时间 2、小球落地时的水平位移大小 3、小球落地时的速度大小 英语作文介绍我和我的家人怎么去上学或者上班题目怎么命名 还有这作文怎么写 一学生用F=100N的力将一质量为0.5千克的足球迅速踢出,球在水平地面上滚动距离S=20米,则该学生对足球做的功是多少呢? 怎么让D1是A1和A2和A3的数字.且让F1计数为1.F1公式在图中.如图： 单杆液压缸活塞杆直径D=50mm缸桶的内径=200mm工作压为P1=4MP流量Q=20回油压力p2=0.5MP求活塞往返推力F1 F2方套 的机械制造工艺与机床夹具课程设计的CAD图,最好全套, ,一个泵驱动两个串联的液压缸,已知活塞直径D=90mm,活塞杆直径d=60mm,负载F1=F2=10000N, 如图所示,G1＝50 N,G2＝30 N,F1＝50 N,F2＝30 N,设在图中物体的加速度左图为a1,中图为a2,右图为a3,则它们的大小关系是 右图是小刚设计的一个通过简单机械自动拉开开关的装置示意图图23是小刚设计的一个通过简单机械自动拉开开关的装置示意图,该装置主要由滑轮组、配重C、D以及杠杆AB组成,配重C通过细绳 I used to have a dog 我以前养过一只狗,翻译的对吗 英语翻译是一篇文章的中文翻译 翻译I have a big police dog who is named Juck急啊!请大家帮帮忙,帮我把这句话翻译出来!谢谢各位! 英语翻译希望一定要标准, 阅读理解 Swimming is very popular in summer.People like swimming because water makes .people feelSwimming is very popular in summer.People like swimming because water makes .people feel .If you like swimming and swim in a wrong place,it may not b Swimming is very popular in summer. People like swimming in summer because water makes them (1)_______ cool. If you like swimming but swim in a (2)______ place, it may not be safe. These years, more than ten people (3)______ while they were enjoying Swimming is very popular in summer. 一子弹以速度V0飞行时恰好射穿一块固定不动的木板,当子弹的速度变为3V0,它能射穿相同的木板A、3块B、6块C、9块D、12块 子弹恰穿4木板,则穿第一块的速度?具有某一速率v的子弹（不计重力）恰好能垂直穿过4块叠放在一起的完全相同的固定木板.如果木板对子弹的阻力相同,则该木板在射穿第一块木板时的速率为