冷热流体热量衡算式

since before的用法想知道这两个单词怎么用有什么区别．只要句型即可．谢谢 since 和before 作“以前”解释时的用法和区别? 替我解决,thank you~在月经期的女孩跟男生接吻会怀孕吗?为什么? Thank you某人从家骑自行车到火车站,如果每小时行15千米,那么可以比火车开车时间提前15分钟到达；如果每小时行9千米,则要比开车时间晚15分钟到达.现在打算比开车时间提前10分钟到达,那么 since和before的用法有什么区别呢 求解释加点词语意思 2A:thank goodness,you are here. what ___you ?B:traffic jama keepss b is keeping c had kept d kept为什么选D是什么意思 "Here are you." "thank you."修改病句 Here you are.apaut ( ) away.thank you (1).Thank goodness,you are here!What_you?A.keeps B.is keeping C.had kept D.kept(2).I have won a holiday for two to Florida.I___my mum.A.am taking B.have taken C.take D.will have taken(3).Selecting a mobile phone for personal use is no easy task becau 英语翻译再加上读后感 after和before的用法 如何删除谷歌翻译中的中文原文 英文 during when before after的用法我经常觉得很奇怪对于be4和after的用法.I'll wash my hand be4 dinner?不是等于 i'll have a dinner after wash my hand.只是前后的内容调转而已吗?During the jourley 不是等于 when i was Aileen这个英文名怎么读?请用中文拼音拼出来可以么. Aileen怎么读,用语音 That kind of shit was sold out.was 后为什么用sold? 丽心 英文名 泽心 英文名性别：女 名字谐音一点.不要太普通. The girl always asks me for ___ when she was in troubleA some advices B pieces of advice C an advice D many advice我在纠结到底选B还是选D she'll always be the girl from yesterday是什么意思 英语题目Several ____ new books were sold out last week.Several ____ new books were sold out last week.A.of thousand B.thousands C.thousand of D.thousandWhy? 大阉之乱,缙绅而不能易其志者,四海之,有几人屿? 帮咱取个英文名.咱叫王怡心.我有英文名额.wing、 我想取一个英文名,我的中文名是心成,最好相关.名字要简单一点的,读起来上口.我是女生. how are you feeling today?_______ better.Thank you 我单名一个“心”该怎么取英文名啊?好记一点的,如果取的好,我追加500分! How are you today的答句A.I'm OK.B.Good morningC.Thank you How are you today怎么回答 英语翻译You must not be reading my messages. 英语翻译The ultimate expression of propaganda mode section in the theme selection and arrangement of the same structure,leading to the leadership level according to news reports stick the size of the order of the way of news presentation,will lea 英语翻译Second,regional and differences of the positioning Limited to the traditional news model,in addition to ten by the abundance of political and cultural environment will be,a lot of local TV news program presents a "homogeneous" character."