为什么会基因突变

【s减2t】【负s减2t】减【s减2t】等于 草酸钙是人体内不能吸收的沉积物,菠菜、洋葱、竹笋中含有缝纫福的草酸和草酸钠,豆腐中含有较多的钙盐如硫酸钙等.化学工作者证实上述物质可以发生如下复分解反应：Na2C2O4+CaSO4==Na2SO4+CaC Fill in the blanks with the words given.Then make your own sentences with the words.（不用造句）(happen,bring,do well in,borrow,pass on)1.Can you____some music CDs to the party?2.My friend_____English so she often helps me with my projects.3.He 一项工程,甲乙合作6天完成,由乙丙合作12天完成,由甲丙合作8天完成,如果由甲乙丙3人独做哥要几天完成?速回 某车间男工占全车间人数的3/7,后来又调进15名男工,这时男工人数占女工人数的6/7,男工原有几人? 某厂男工占全车间人数的7分子3,后来又调进15名男工,这时难工人数与女工人数的比是6比7,问原有男工多少 世界上最重要的港口有哪些?他们的英文名是什么? 草酸钙不溶于稀强酸可以根据这个检验钙离子,可是为什么不溶于稀强酸?强酸制弱酸不就好了吗? 问欲将0.1摩草酸钙完全溶解于1升盐酸中,盐酸浓度最低多少 以后人类会消失吗 未来人类为什么会消失 首字母填空 They could h___ hear what the teacher was talking about. beatitude you to find your 连词成句 2.Jim,his,teacher,asked,what,do,next,to.________________ game race competition match有什么区别拜托各位大神 Jim,his,teacher,asked,what,do,next,to 组句 求a story about missing trains 急200字左右 -------what to do next ,I asked my teacher for advice.A.Don't know B.Not knowing C.Not to know D.Not know该选哪个啊.哭求. Foster The People的《Miss You》 歌词 一项工程,甲乙丙三人合作须六天完成.现在由甲乙合作1天后,剩下丙独做8天完成.丙的工作效率是（）. I could tell the looking your eye是那首歌的歌词"I could tell the looking your eye..lose you...they are lose the shy... "这部分歌词是那首歌的?一首英文歌,女的唱的,节奏很轻快,开头是“bang,bang”,第一句中有“hear 一项工程,甲,乙合作6天完成,甲乙合作3天后,余下丙单做,甲乙丙共做8天完成2/3,丙单做多少天完成 求歌名 开头是这样唱的hello is it me your looking for?l can see on your eyes最好有下载链接哈···hello is it me you looking for l can see it on your eyes The professor could tell by the blank look in Maria's eyes that she didn't understand a single worThe professor could tell by the blank look in Maria’s eyes that she didn’t understand a single word of his lecture.blank... 一件产品原来每件的成本是500元,销售价为530元.为了提高利润,工厂两次降低成本,使每件的销售利润为125求该产品的成本价平均每次降低百分之几.（一元二次方程?） 一件产品原来每件的成本是500元,销售价为530元.为了提高利润,工厂两次降低成本,使每件的销售利润为125元,该产品的成本价平均每次降低百分之几 甲乙两车分别从AB两城相对开出,甲车每小时行32千米,乙车每小时行28千米,甲车开出2小时后,乙车出发经过4小时相遇,AB两城相距多少千米? AB两地相距28千米,甲乙两车同时分别从A,B两地同一方向开出,甲车每小时行32千米,乙车每小时行25千米,乙车在前,甲车在后,（）小时后甲车能追上乙车 甲、乙两人同时从A城出发到B城,甲每小时行32千米,乙每小时行28千米,多长时间后,甲乙两个相距16千米?请把公式写一下! draw look and draw lines急 I likes____(read)and____(draw).横线上该怎么填