星形负载中性点一相开路后，三相负载电压有何变化

要分式方程甲乙两个两个施工队共同完成某居民小区绿化改造工程,乙队先独做2天后,再有两队合作10天完成就能完成所有工程.已知乙队单独完成此项工程所需天数是甲队的4/5,求甲乙两个施工 用长为10米的铝合金制成下部为矩形,上部为半圆的窗框,求此窗户的最大透光面积.答案为50/8+π 在3点和4点之间,时针和分针有多少次能形成90°的角?请求出这些时间.关键是要分析.在3点和4点之间,时针和分针有多少次能形成90°的角?请求出这些时间.关键是要具体分析. Read this passage and decide which of the foollwing statements are True and which are False.什么意思？ Read the following sentences and decide if they are true or false:If you want to be certain of seeing a play in London,you have to book your seat in advance .You can buy your tickets either at a theater it shelf.It is very rare that you will be lucky 爷爷今年69岁,爷爷的年龄比小明年龄的5倍大4岁小明今年几岁? 今年,小明年龄是爷爷年龄的1/5,小明发现12年后他的年龄变成爷爷年龄的1/3,小明和爷爷今年各几岁?列方程组 窗户的形状如图所示图中长度单位厘米其上部是半圆下部是边长相同的四个小正方形已知下部小正方形的边长是a厘米计算一窗户的面积二窗户的外框的总长. 晶体 固体 分子晶体分子晶体属于晶体,而晶体又都是固体（不算液晶）,氧气是分子晶体,这么说氧气是晶体,可晶体是固体啊,矛盾了, 1-2x的立方根加上3x-5的立方根等于0 怎么解 6.28乘以0.8减0.628加0.3乘6.28怎样算才简便? 学校阅览室窗户是半圆,下面是正方形,窗户的面积是多少平方米?正方形的长是1.2m 请问有什么常温下呈固态的分子晶体 公文改错题请将下面错误的地方改正过来.关于推荐吴华等九位同志参加××考察活动的请示报告×规发〔2003〕06号省外办：根据你办《关于组织××省第十届对外交流考察活动的通知》精神,经 求解公文改错题1 很急 给10分.请将下面错误的地方改正过来.关于推荐陈雨等九位同志参加××考察活动的请示报告×财发〔2002〕07号省外办：根据你办《关于组织××省第九届对外交流考察活 公文改错怎么改,是在原题改吗 公文改错题（找出下列公文中的错误并说明理由） ××市府公文[紧急] (07)×府发21号 ××市人民政府严厉打击非法出版活动的通知 当前,我市一些地方非法出版活动十分猖獗,传播有害书刊音像 解答公文改错题五、公文改错题(指出下列公文中的8处错误,关于推荐孙鹏等十位同志参加××考察活动的请示报告 ×财发\[1996\]05号 省外办：根据你办《关于组织××省第九届对外交流考察活动 一个窗户的形状如下图,上部是半圆,下部是长方形,求它的面积?长方形长1．2米,宽1米．请列试计算 怎样把一个边长为1米的正方形面积增加1倍,但要求形状不变,说具体，比重谢 下列物质属于晶体的是1水晶 2玻璃 3冰 4石膏 5明矾 6塑料解说一下加10分 下列物质中属于晶体的是A:塑料,沥青,蜂蜡 B:铁, 萘,松香C:明矾,冰,铁 D:水晶,玻璃,食盐 几道改错题1.You may dress more casual at home.2.In his thirty,he left his motherland for Canada. 帮我做几道改错题,1.His success depend on honest and thinking deeply.2..I do not want to been a person who likes Adams.3.When Adams copied his speech ,he just to put everything he had memorized.4.To Adams we always criticize his nasty behavior as shown in the picture...是不是as后面是不是有is? 改错题目几道1,The rent sounds reasonable.How would you like it to pay2,While walking through the crowds ,she heard her name calling behind3,In almost every city around the world ,new uses are given of the old buildings4,twenty-foot high walls o 请翻译As shown in the following diagram,there is a triangle ABC.Now we extend the length of Side AB to Point D,which makes BD=ab; while we estend the length of Side AC to point E,which makes CE=2AC;THUS we can get a bigger triangle ADE.Now please 请翻译As shown in the following diagram,the area of Triangle ABC is 56 square ventimeters,which is two time of the area of Parallelopram DEFC.Then,how many square centimeters is the area of the shaded part? m4+m2+1=m4+_-m2+1=(m2+_)(m2+_) 求问长城M4和长城M2哪个好 化简 (m4+4m2+16)分之(m4-16)除以(m3-8)分之(m2+4)乘以(m2-4m+4)分之(m2-2m+4)除以(m+2) 请翻译 The following diagram is a piece of rectangle-shaped grassland,and its length and width are respectively 16 and 10.There are two roads,respectively in the shape of rectangle and parallelogram,on the grassland,Then,what is the area of the pa