我爱春雨300字

求简单介绍一下三相电,和其中几根线的作用, 在地球上怎么测星星的视角啊?又不能连线 还不可以投影 三相电不平衡时中性点接地有什么作用?是带的电荷从中性点排到地上去吗 根据首字母提示写出单词.Suddenly,Wang Qiang sees his unlce s____.He says,'Uncle,look at that sign.It means"No smoking".You can't smoke here.'His uncle says s____and goes o_____of the cinema. 英语问题：根据首字母的提示写出单词1.I'm h___ at home.I often help my mun di the housework.2.Children wear c___ at Halloween. 化学变化图像对么 英语有哪几种词如：名词 乳汁是由什么形成的? I.think ____ necessary for students.to take an interest in all subject.A.that.B.this C.it.D.one.求详解 请问这句话是什么意思? 1.be useful to_______ 2.be helpful to______3.be important to______4.be necessary to______填doing或do necessary 与 important的区别.eg Some parents like to hold birthday parties for their children .If they keep on doing this ,thier children will think it ____ for them to enjoy birthday parties every year,答案是necessary 谁能告诉我下面这个升压电路的原理,各部件的作用,怎样计算1.5v—9v,小弟急用.第一个电路图 一句中的破折号表示什么意思 “是”前面三个字,求一个四字成语 翻译文章：sleepSleep Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows. When you fist drift off into slumb It's important to keep enough sleep.保持充足的睡眠很重要可以这么说吗? 求It`s important to get enough sleep原文! Have you just enough 翻译成中文? 下列语句中哪个句子有错别字?A\自然灾害固然可怕.官府的横征暴敛比自然灾害更可怕,因为年成有丰有欠,而官府的压榨却无止无休.B\没有什么好菜,凑合着吃点吧. now you have me there is enough翻译中文 如图,四边形ABCD内接于半圆O,AB为直经,过点D的切线交BC的延长线于E,若BE⊥DE,AD+DC=10,AB=8,则BC=?因RT△ODF和RT△COB中OD=CO故RT△ODF≌RT△COH兄弟，这步错的啊 圆内接四边形ABCD的两组对边AB与DC,AD与BC分别交于点E,F,过B,D做圆的切线交于点P,求证,P,E,F共线 四边形ABCD内接于圆,其边AB、DC的延长线交于点P,AD、BC的延长线交于点Q,过Q作该图的两条切线,切点分别为E、F.求证：P、E、F散点共线 心语是一个很抽象,是难理解的词语吗? 等比数列前n项和例题1 等比数列的前n项和的一个填空题等比数列{an}中,S2=3,S4=5,则S6=______ “等比数列的前N项和”的例题～已知等差数列{AN}的前N项和为SN,且A3=5,S15=225.数列{BN}是等比数列,B3=A2+A3,B2B5=128.（1）求数列{AN}的通项AN及数列{BN}的前9项的和T9（2）求使得1/AN-7＞1/3成立的正整 为什么要先读易经 一到等比数列的数学题等比数列｛an｝的首项是6,第6项是-（3/16）,这个数列的前多少项的和是255/64?求详细过程,谢谢! )已知等比数列{an},Sn是前n项和,若S2=3,S4=15,则S6=? 用做图像的方法解下列方程组3x-y=4{x=y-1