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有关空白对照和全营养培养基对照分离以尿素为氮源的微生物）空白培养基不就是什么都不加的牛肉膏蛋白胨培养基吗?全营养培养基不也是吗?有什么区别啊? 培养基可食用吗?有营养吗?生物老师说培养基可以食用,我想知道培养基由什么构成?除琼脂外还有什么成分?对人体有什么利弊?还有,那个牛肉胨是什么物质,是牛肉提取物吗? my hobby is read帮忙写一篇英语作文,最好带翻译,要原创的~~~~~~~~~ 喷灌施肥器是什么样子? 英语翻译我是看有个百度上有个翻译,简直就是用翻译软件翻译的,和电影里一点都不一样.自己补充In the space between what's right and wrong,在对与错咫尺之间 you will find me waiting for you.我会在那里等 哪位有《Over and over》的汉语歌词?Over and over简单又好听,只是不知道汉语歌词.Over and over》---Nana Mouskouri演唱版I never dare to reach for the moonI never tought I'd know heaven so soonI couldn't hope to say how I feelTh --I think you should phone Jenny and say sorry to her--_____.It was her fault.A.No way B.No possible C.No chance D.Not at all选哪个,为什么 帮忙看看这个恒流源电路,它是怎么通过DA输入电压达到预期的电流的?运放起什么作用的,怎么通过MOSFET的到恒定电流的》? 特别是输入电压和恒流源电流值大小的关系电路图 阅读理解Tea bag drinking is most Westerner' favorite way of drinking tea . 用这些组成句子:is drinking tea cup a grandpa of说了有5分 You should put the tea bag in the hot water for half an hour befor drinking.针对for half an hour 提问 英语翻译主要是后面两句,前面那句估计是个人都知道啥意思了 φ8 0.5W的LED 电流要求要120±10mA怎么用恒流源调?电阻要用多大的? I think Sally should say she's sorry to her mother 改为同义句I think Sally should say____ _____ her mother. 怎么测量电流恒流源电阻 My favourite hobby is reading（对划线部分提问）reading是划线的~ I'm Daisy.at the police station.1.Where did the accident happen? A.On Ocean Road. B.At Daisy's school. C.Outside the polite station. D.Outside Daisy's house.2.What's the meaning od the word "continued"? A.turned round B.kept going C.s hobby is reading 作文 Reading is my hobby是一般现在时吗?Reading is my hobby.这句话是一般现在时吗?如果不是那他是什么时态的句子,如何改成一般现在时? you should say sorry to your close friend --yes,i regret( ) with him.A to quarrel B quarrelling police station的意思 ＂police station＂是什么意思? 马歇尔耳机怎么样 用英文解释“police station”是个怎么样的地方比如说那是个抓坏人的地方等等, 谁知道,马歇尔是怎么死的 作文：广告是否是不健康饮食的主要原因/advertising is the main cause of unhealthy eating habits?给几个论点吧 马歇尔欢迎你怎么样 帮我看看这句话有没有语法错误~托福作文,Shortsightedness is the mostShortsightedness is the most polular disease the children easily suffered from.我总觉得是不是很顺啊...托福作文要用的~ One of the most highly effective free online advertising is through a traffic exchange.please translate advertising is only part of the total sales effort.but it is the part that attracts the mostattention.广告仅仅是整个销售活动的一部分,但它是最吸引人注意的一部分.这句话中第一句的effort做什么解释?他不是(努力 移动洗澡机的发明者是谁?发明者是中国湖北的余成龙.2012年8月,在一个偶然的机会,余成龙萌生了发明移动洗澡机的念头.2013年5月,推广上市,由于用移动洗澡机解决了,流动人口洗澡难题,很快得