甲乙两种衬衣原价相同

江湖救急!y=根号下Inx +e的负2x 求dy 零线和地线又什么区别.零线和地线都接在大地上吗零线和地线都接在大地上吗? 地线是怎样将电流引入大地的? aways birthday her is months September on 10th(.)连词成句 My birthday is months 英语中名词在什么时候加s?我不是问怎么变,我是问在什么情况下加s.英语中名词在什么时候加s?我不是问怎么变,我是问在什么情况下加s,名词在什么时候加ing?还有动词在什么时候加s,什么时候 英语like加S干什么? 鲨鱼为什么会怕海豚? the store sells all kinds of clothes.(改为一般疑问句） ----the store ----all kinds of clothes? 中国有哪些湖泊 为什么鲨鱼怕海豚?照理说鲨鱼应该打得过海豚的啊 中国海拔最高的湖哪个湖? 中国海拔最高的湖泊是什么湖泊?位于什么省份?在我国平均海拔最高的省内哦!A：纳木措 B：艾丁湖 C：青海湖 D：洪湖 我国海拔最低的湖泊是哪一个?它位于哪个盆地? 在中国,海拔最高的湖是什么湖?海拔最低的湖是什么湖?最咸的湖是什么湖?最好写出地方名称 一切都是未知的英语怎么说 所谓的单相接地故障是指电流流入大地呢?还是与地线接触,流入地线?如果流入大地后又为什么会流回变压器中性点呢?请电气高手帮我讲解下当中的过程吧 农村供电变压器,有偷电的用其他变压器的相线,零线用本配变的零线,对本变压器有何影响?我的意思是对变压器运行,和线路的损耗,还有就是线损（变压器总表电量减用户表电量）有什么影响! 声音的词语 声音的词语有哪些 描写声音的词语有哪些?4字的 几个英语单选1.--Do you mind if I open the window?--＿＿,but I've caught a bad cold today.A.No,not at all.B.Yes,of course not.C.Yes,please.D.I'm sorry.2.--Mom,can you buy me a new MP3 when you are on business?--As long as you are admitted to a 几个英语单选 急!1.The peasants were told to leave the village the typhoon was on its way.A．by the timeB．for the timeC．at the timeD．the timeD2.To his surprise, Jack found his son _______as Santa Claus on Christmas Eve. A. dres 帮忙做几个英语单选1.Excuse me,could i borrow some money from you?- -Of course you ________A ,could B,can C ,must D,should2,Why ____you join the music club?you sing so well.A,not B,do C,don't D,won't3,LOOK!how dirty the river is!---But it ___ 英语几个单选几个单选1.he is one of those people————everybody will find hard to please.a.that b.whom为什么呢?2.it is such a good place ————everybody wants to Visit ————it is well-known all over the world.a.as：as 变间接引语"My bicycle has been stolen,"he said,"I shall have to telephone the police." He p________to the new bike under the tree and said, “look, that’s mine”.R.T. 快点回 选择He said that he ________his bike at that time A.mends B.is mending c.was mending D.mending选择He said that he ________his bike at that time A.mends B.is mending c.was mending D.mending he said that his bicycle needed __后面选哪个选项A.to repaid B.repairing C.repaired D.being repaired是被动语态的单项选择题我也觉得选A 看书上答案不是选A 为什么有地线?大地的电阻是多少?什么时候电流才会流向大地? 既然电流会从零线流向大地,那零线和大地间有电压吗? 电流通过火线零线流到大地后上哪了不是说必须要有回路吗,那它怎么跟火线构成回路