某老师把某小组五名同学的成绩简记为:+10,-5,0,+8,-3,又知道记为0的 发布时间:2017-04-02 05:37 │ 来源:www.tikuol.com 题型:解答题 问题: 某老师把某小组五名同学的成绩简记为:+10,-5,0,+8,-3,又知道记为0的实际成绩为90分,正数表示超过90分,则这五位同学的平均成绩为______分.
题型:解答题 短文改错 At first I was not quite willing to sit down and watched the 90minute1.______football match.Usually I just checked the results because I thought that was 2.______dull towatch a game in that players kicked a ball to each other.3.______Therefore,my father loves football.During the World Cup in 2006,my dad 4.______stays up late just to watch his favourite sport. Seeing 5.______ him strong interest in this game of 22 men 6.______run after a ball,I decided to sit down to watch the game.7.______ I found game exciting,and my dad explained8.______ for the rules.We shared our joy.Football is not 9.______too badly as long as I watch it with my dad!10._____ 查看答案
题型:解答题 碳元素是组成许多物质的基本元素。(1)下列含碳元素的物质中,属于有机物的是 (填字母序号)。(2)化石燃料主要包括煤、 和天然气,它们都含有碳元素,其中天然气燃烧的化学方程式为 。(3)甲醇(CH3OH)是一种生物质能燃料,它是无色、略带酒精味的液体,易燃,有毒,密度比水小,能与水相混溶。其中属于甲醇物理性质的是 。(4)二氧化碳可用于生产碳酸饮料,其中发生反应的化学方程式为 _。(5)过多的CO2排放会造成温室效应,为了减缓大气中CO2含量的增加,以下建议可行的是 (填字母序号)。A.使用清洁燃料氢气B.开发燃煤新技术充分利用燃料C.合理使用煤、石油、天然气等燃料D.开发太阳能、风能、地热能等新能源 查看答案
题型:解答题 把下面的数位顺序表填写完整.______级______级______级______亿位____________十万位________________________个位想一想:每相邻两个计数单位之间有什么关系? 查看答案