令我难忘的一件事500字

用一根长L=1m、最大承受Fm=46N的拉力的细线,拴着一个质量为m=1kg的小球,在竖直面内做圆周运动,已知悬点O离地面高为6m.求（1）小球通过最低点的至少多大方能把细线拉断?（2）若细线恰好被拉 2相步进电机有哪几种工作方式?有什么2相4拍的吗? 地球哪个国家的森林覆盖面积最大很好 你知道我国现在森林覆盖面积和其他国家的吗?我急!一定要现在的,不能是其他时间的哦, 在一张圆薄饼上切10刀,最多可得到多少快小饼?切N刀呢?```我不是很懂做这题谁能帮下忙`` 一个圆饼,切十刀,最多可以切多少块(不可重叠) 1M电阻是不是要1000000个1Ω电阻串联? 一个梯形下底长是上底长的两倍,高为4cm,面积为12平方厘米,求两底之长 步进电机跳线是什么意思 梯形面积上底延长4cm,面积增加24平方厘米,原来上底12厘米,求原来梯形的面积?10分钟完成成翻倍. 在一张圆饼上切10刀,最多可得到多少块小饼?切n刀呢?要具体过程,谢拉! 小明在一张比萨上切10刀,最多可得几块小饼 一个梯形面积420平方厘米,如果把它的下底增加12厘米,他的面积是468平方厘米,原梯形的高是多少厘米? (always,usually,sometimes,never,yet) I have _____ been here before.Have you everbeen there?—No,Have you everbeen there?—No,not _____.I often have a rest in the morning and _______ in the evening. 一个梯形面积420平方厘米,如果把它的下底增加12厘米,他的面积是468平方厘米,原梯形的高是多少厘米? You have always been there for me Thousands of people in the disaster areas will suffer a lot if these supplies don't ___in time.A.pay offB.set out C.get throughD.use up求详解 用一根绳子测井深,双股量,井外余3米,3股量,距井底还差1米,井、绳各多少米?（用方程解） people have always enjoyed laughing 是什么时态的 I have always been a person Chinese people have always dreamed of flying to space帮忙翻译下这句话谢谢 I find no people around为什么是这样?I don't find people around 请讲讲相关的语法 I found many people _____(walk) outside . The teacher found Tom was c—— from Liz while she was walking around.填什么c后边写什么 _____ (walk) around your school and _____ (find )the equipment . 7.After the bomb explosion in the cinema,people were seen _________ out of the cinema.A.stepped7.After the bomb explosion in the cinema,people were seen _________ out of the cinema.A.stepped \x05\x05B.walking \x05\x05C.scrambling \x05D.wandering 英语翻译Always there When I'm less than I should be,When I just can't face the day When darkness falls around me And I just can't find my way When my eyes don't clearly see And I stumble through it all You I leen upon,you keep me strong And you r there are _____(hundred) of people dancing at the square after supper. 英语翻译when i'm less than i should bewhen i just can't face the daywhen darkness falls around meand i just jan't find my waywhen my eyes don't clearly seeand i stumble through it allyou i lean upon ,you keep me strongand you rise me when i fallY 是the people after he还是the people after him 为什么 设函数f(x)=(m+1)x2-mx+m-1.若方程f(x)=0有实数根,求M的取值范围 she is the last to