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用轮滑组提升重物的过程中,在不考虑绳重及摩擦的情况下下列做法能提高滑轮组机械效率的是...A减少重物的物重B不改变物重,把话论组换成另一种绕法C增加重物的物重D增加提升重物的高度 who do you think( is) the most popular teacher in our class?think后面不是跟动词ing形式嘛,为什么这里不用being而用is 没有摩擦的机械, 其机械效率一定等于1 物理机械效率哪个公式不考虑摩擦才能用 Both Mary ang I think our English teacher is the most popular at school.A.so does Jane B.so jane does C .so jane is D.so is jane I don't want you appear in front of me Don't pick your nose in front of me.什么意思? Don't affect pussy in front of me 如图所示已知A物体重力为10牛顿不计机械自重和摩擦组合机械平衡则B物体重力为从左数第二个滑轮上面中间有绳子吊着,忘记了 Careful to savor solitude英文什么意思 在不计摩擦和机械自重的情况下,利用杠杆、动滑轮组、斜面三种简单器械,把重物提高3m,如果动力做工相等则哪种机械提升的物体质量大?或者一样大?（请附上解析）如有满意答案追加5分.谢 物理题设计三种方案用F=1/3G的力将重物G提高h(不计摩擦和机械自重)需要图 英语 单词 “横”肿么组词?（第四声） Mr Zhang is the best music teacher in our school,but he has hurt his left foot and cannot__tommorw's concert.Atake part B play a part in C paticipate D participate in Mr Zhang was the only teacher who worked over-aged in our 英语翻译1．要之不悖于道义者,皆可取也.2．则夫贾生之志,其亦可罪耶?3．然世之知者,其谁‘与欠’（不认识这个字）?虽不吾知,谁患耶!都出至一篇文章, 翻译,文言文.短句是亦彼也；彼亦是也；彼亦一是非,此亦一是非 使用简单机械除了省力外,还有什么别的优点? It's hard to study English. 机械组织的作用是什么 这个是什么?有什么作用?一般在什么设备上有? 哪些机器上用到我们学过的机械它各起到什么作用 it to make 传第四声怎么组词, Mr.Chen is ____ principal of our school用冠词填空 chen ____teaches in our schoolA no longer B not longer C doesn't longer要解释为什么 Mr Li is one of the best_______in our school(teach)我填teacher老师说不对啊 积累好词好句古诗 关于雨的诗句,好词好句 when trouble comes your friends are the ones who will be there 翻译成中文 指教. 英语阅读:true friends are hard to find.often you will find that there may btrue friends are hard to find.often you will find that there may be someone who you thought you could trust but who may have let you down.a tuue friend is someone who will