已知X和Y的期望，求X＋Y的期望

支原体dna阳性是什么意思 D-二聚体的结果显示 ＜0.3.参考值是0.044-0.246mg/l 是不是验出来不好啊. 什么是预聚体 完颜宗弼（又名兀术,乌珠）,完颜宗翰,完颜宗望,这三人是啥关系?君臣关系,兄弟关系,还是两者都有? 什么是同二聚体 什么叫附聚体请问哪位高人能聚体定义一下什么叫 附聚体 D-二聚体高怎么办? 再次统一女真各部的人物?政权名称?谁改女真为什么族? He is a man改成复数句子 stake有哪些意思The investor takes a stake in Burlington Northern amid a resurgence in the sector's shares. Some pros see a smart long-term play babysit的现在分词 the first time 后接的时态 俄国的 单词 一词怎么拼 单词拼写,每空一词I don't like ____(记录片).April the ____(十三) is my mother's birthday.I like school ____(郊游) .The blue______ (羊毛衣) are fifty _______ (美元) each.They ______(不能) speak Chinese.I usually go _____ (跑步) 英语 Dutch artist 啥词?Thousands of people lined theshores of Taiwan's largest harbor to cheer the arrival of a massive yellow rubber duck,Dutch artist Florentijn Hofman has taken his creation around the world to spread a message of happiness,it Hkong Kong has been considered as a good place for shoppers to visit for a l.英语阅读理解 HTC desire S 和HTC desire z那个好【待选机型】：HTC/Desire Z、HTC HTC Desire S(G12)跟HTC Desire Z哪个好 But it's not a good place for eating. HTC Desire Z和HTC Desire S区别像入手htc来玩玩,DHD太大,IS价格居高不下Z价格2500左右S价格2800左右这两款有什么区别?哪个性价比高呢? main course是什么意思 main course 和 entree 有什么区别啊?中文分别是主菜和正菜,但是这有什么区别呢? introductory-level course 什么意思? 自古以来莲花就受到国人的喜爱和尊重,有人甚至提议将莲花作为我国的国花,你的看法怎样? My name is SunYao · LiHui · in my heart is my boyfriend 英语翻译 power-law dependence 中文怎么翻译 I say i'm crying,do you think it's real?有语法错误吗,有的话 charge怎么读 My mum‘s work is to do all the household chores.我想解释我妈妈是做什么的,但是不想说housewife这个词,听起来有点贬意,我英语应该怎么说,说我妈妈是在家工作,我妈妈负责所有的家务活,除此之外,她还 And I can do anything that I want.有语法错误吗?这句话有错误吗?如果有, I can do everything that you say有语法错误么