怎么判断极性分子和非极性分子

已知正比例函数和一次函数的图象都经过M（2,5）,且正比例函数的图象,一次函数的图象与y轴围成的面积为7求正比例函数和一次函数的解析式 语重心长怎么造句 名人读书的故事（好词多点) 名人传读书好词好句好词好句啊! 看不懂.求救!说明第一问即可.我错在哪里？ i see you play tennis ____几乎every day I play tennis every day变为一般疑问句 Do you like playing tennis?No,( )I like sports. I play football every Sunday.A.and B.but C.so D.or Every day do you play the piano?do you play the piano？前面加什么？两个单词 She什么(play)tennis every day 如何用“语重心长”造句麻烦告诉我 不定积分换元积分法 不定积分的第一换元积分法和第二换元积分法的区别? 我看不懂科学实验表明,原子中的原子核与电子所带的电荷是两种相反的电荷,原子核所带电荷为正电荷.氢原子中的原子核与电子各带1个电荷,把它们所带电荷用正数和负数表示出来? 用第一换元积分法求不定积分. 请问13减去7又3分之1=?最好再列个式子！ 关于不定积分中的第二换元积分法题目是积分((x+2)除以(x^2乘以根号1-x^2)) 问道数学有两筐苹果,甲筐苹果比乙筐苹果重14千克.甲筐卖出7分之4,乙筐卖出5分之2后,两框剩下的苹果重量相等,原来甲筐有苹果多少千克?要过程 I like playing soccer中的playing为什么不是play不准抄袭,要具体 题【】 中的S N+1后面的式子是什么算出来的啊 />第三题 】】】】】 if you don't like playing soccer,you can play basketball___1 instead 2 instead of 3 take the places of 4 instead of play soccer 首字母填空 1.What’s the matter with him?The noise made him m____.What’s the matter with him?The noise made him m____.Look,it's raining outside again.What bad weather!I can't work in high s____.We must obey the traffic rules,e____ whe “make a noise”还是“make noise” make a noise与make noise有什么区别?有无 “a” 有什么意义? make a noise与make noise有什么区别?请举例 除了Big big world还有吗?一些女生唱的英文歌!可爱一点,卡哇伊一点,有点创意,呵呵,有些麻烦! make noise 与 make a noise 的区别是什么试卷上既出现了make noise 也出现了 make a noise make noise 和 make a noise的区别?请说出理由 Many teenagers feel that the most important people in their lives are their friends.They believe that their families don’t know them as well as their friends do.In large families,it is quite often for brothers and sisters to fight each other and th live to play,play to live 是什么意思如题 Tom!Don't play with your toy alone.You must learn to_.A.have fun B.play Cshare D.enjoy youself But someone may have the chance to enjoy the flowers 英语翻译网 We shouldn't make too (many/much) noise.说明理由