弹性势能具有什么性

抗生素的效价是不是就是表示它的纯度\浓度? 请问：这抗菌素药物30µg浓度怎么读?这浓度到的是多少?抱歉因对化学方面不是很精通,这是从几个网站摘录下的某药物的浓度数据,请问：30µg浓度怎么读?通俗的讲这浓度到的是多少（ 这个电路有什么错误? Were the flowers beautiful?yes,_____ Where were you yesyerday evening?为什么要选择were(理由) with his saying sorry for being difficult for herself 求解 ,帮我分析一下这句话 ,为什么是“跟自己说声对不起,因为曾经为难自己” Sorry for interrupting, but do carry on with what you were saying.这句什么意思 pleased with strict in ,angry with ,sorry for 的意思He received a warm welcome there and was very _____ everything .这些词是词组或短语吗? comprehension precis and composition Answer these questions in not more than 55 words 1,Where did tcomprehension precis and compositionAnswer these questions in not more than 55 words1,Where did the writer go last week?2,Did he enjoy the play or not? 根据单词适当形式填空 1.What's ________(happen)there? Byrd and his men were able to take a great many photographs of the mountains that lay below上面句子最后的that lay below,是定语从句?怎么理解它? 英语翻译是伯德和他的助手们拍下了飞机下面连绵群山的大量照片.这句话里哪有飞机这两个字below怎样理解 They were able to take a great many photographs of the mountains.在这句话中,为什么要加a? 巴斯德在生物学上的贡献RT 科技屎论文 好的多给 Your mother a cunt 翻译成中文是嘛意思啊? 王力宏的歌cockney girl中的cockney什么意思?王力宏的歌迷们,cockney 配制好的培养基和消毒后的培养基能放置多长时间? 强调谓语动词时do/did/does后面的动词用什么时态 This anti-smoking campaign is mainly aimed at teenagers.This anti-smoking campaign is mainly aimed at teenagers.为什么是 be aimed at 哪里体现被动了呀? 关于spice girl 的mama这首歌的歌词的中文翻译请圆滑些歌手：Spice Girls 专辑：Spice World Spice Girls MAMA She used to be my only enemy and never let me be free Catching me in places that I knew I shouldn't be Every other day I c He did not know选择He did not knowA how could he get there B how he can get thereChow to get there D how could get thereHe did not know是主谓 C是疑问词加to的不定式做宾语,为何不能选ABC 做宾从 I am anti other people smoking.anti 作形容词可以这样用吗? 关于spice girl的mama这首歌的歌词的中文翻译请圆滑些歌手：Spice Girls 专辑：Spice World Spice Girls MAMA She used to be my only enemy and never let me be free Catching me in places that I knew I shouldn't be Every other day I cr It's aimed specifically at yong people 同义句 It's aimed____at _____ _______ 澳洲新仪器测距仪 按要求将下列句子填完整要求：Rewrite the following sentences.1 Hurry up!The train will leave at 4:15.Hurry up!The train will leave at ____ _____ _____ _____.2 Tom always gets up early.Tom _____ gets up _____3 We seldom go out after suppe 填花名（你能按要求把下列诗句填完整吗?)接天莲叶无穷碧,映日（ ) ( )别样红.忽如一夜春风来,千树万树( )( )开.竹外（ ）（ ）三俩枝,春江水暖鸭先知. 你认为当前文化的发展,文化水平的提高有什么问题?你认为应该怎么解决? i do not know 是什么意识 I do not know I do not know____________.(他最喜欢的运动是什么） I do not know是啥意思?