白磷与氧气反应

一个电流表,一个电源,一个开关,2个灯泡,使两个灯泡并联,可测出L1,L2和 给你两个小灯泡L1和L2,符合实验要求的滑动变阻器,开关,电流表,电源各一个,导线若干,用上述器材探究:L1和L2串联时,流出L1的电流等于流入L1的电流. （1）画出实验电路图, （2）写出实验 如图所示的电路中,电源电压不变,闭合开关S,灯L1和L2均发光,一段时间后,一盏灯突然熄灭,而电流表和电压表的示数都不变,出现这一现象的原因可能是A.L1断路 B.L2断路 填空.1.Let him _____(play)basketball.2.Everyone_____(know)what he really like.3.Tose girls____(be)my sister.4.That girl_____(call)me evety Sunday.5.How___(do)she_____(spell)the word?否定句:在动词前+doesn't或don't.1.She_____ _____(do)her hom 这件衣服很容易洗.翻译成英语 And you know what I really like 是什麽意思? 英语翻译 yow know what I ( do ) really like?与what【 do】 I like?的差别为什么（do）必须去掉,【do】不用 Everyone sees what you appear be few really know what you Everyone sees what you appear be… …few really know what you are 富含淀粉的食物容易导致人长胖?说淀粉分解为糖,而糖容易吸收导致食用富含淀粉的食物容易长胖的就不要回 陆游写的爱国诗篇 陆游的诗大多是在描写什么? 只闭合开关S1,L1亮；只闭合S2,L2亮；只闭合S3,L1和L2都亮；当S1,S2,S3都闭合时,电源短路,求电路图 2010鸡西）如图所示,在电路中要使电灯L1和L2并联,应闭合开关 S1和S3 ,但这样L1不就别短路了吗?为什么要闭合S1 S3 当闭合开关S1、S2为什么电压表、L1、L2都被短路? 谁的平方是18.75 什么数字的平方是75 写一则加强青少年思想道德建设的征稿启事经校刊编辑部决定,校刊第三期主题是加强青少年思想道德建设.假如让你出刊,你怎么写 在积分电路中,并联积分电容两边的电阻起什么作用? Everyone needs friends.We all like to feel c____to someone. 初一轻松快乐过寒假70页阅读理解Everyone needs friends.We all like to feel close to someone. 为何原子次外层电子数不能超过18个?可不可以据此推断倒数第三层不能超过32个呢? 原子核外次外层电子数不超过18个,倒数第三层不超过32个这句话是什么意思? 原子结构图中第三层最多电子数是18个 但最外层电子数又不能超过8个 那镍（质子数为18）的原子结构是什么样会不会最外层刚好18个?错了 镍的质子数是28 会不会有最外层恰好是18个的情况？ 你能想象她是多么细心啊!You can imagine ___ ___ she is! She had about four bananas every day for most of her life这是嘛意思 She __________ (suffer) from depression for most of her adult life为什么不填“has suffered”呢,后面有“for”不是用完成时更好吗?答案给的是“suffered” 青少年怎样为思想道德建设作贡献 Maybe you love her.But she is just a shadow in your life She didn't talk the talk of feminism,but her career was the most important thing in her life.这里的 talk the talk ——do you think the mall ____we passed by is really large ——yes,I like hanging out thereA.where B.that C.who D.it为什么选B不选A? I think the envieonment is really important._____,I like _____ my like.A.Beside,riding B.Besides,riding C.Except,to ride D.Except,riding答案是B,那第一个空为什么选Besides而不选Except?二者分别该怎么用?还有,为什么I