第二类曲面积分公式

三角形ABC中,角A=70°,高BE,CF交于O,则角BOC为? 希唯尔是由谁创立的? 希唯尔在选择材料上有着独特见解,独特性在哪里? 猫哭耗子--泥菩萨过河--狗咬吕洞宾--猪鼻子里插大葱--太平洋的警察--千里送鹅毛--填后面的歇后语 千里黄云白日曛 北风吹雁雪纷纷描写了哪5种景色 价钱的反义词是什么?求急用? 贼价的反义词是什么 请问怎么提高背书效率 某公司发行5年到期债券,票面面额为1000元,售价为960元,年息票面利率为7％,半年付利息一次,试计算到期收益率. A公司5年前发行一种面值为1000元的20年债券,每年付息一次,息票率为10%,同类债券目前收益率为8%,则此债券的现值为?要求有计算过程 公司发行5年到期的债券,票面值为1000元,售价为960元,票面利率为7%,半年付息一次,计算当期和到期收益 千里黄云白日曛 北风吹雁雪纷纷 是你想到了什么样的景象 定积分题,求大大解答多谢 I am going to be have bigger eyes对吗还是去掉have. 理性思维的欠缺得不说如今很多人都太缺乏理性思维,凡事都从主观愿望和感情出发,或者看事物只看见事物的表面和冰山一角,甚至为了迎合自己主观的愿望和感情而凭空捏造一些东西.而全然 一道全等三角形的解答过程已知：△ABC为等边三角形,M是延长线上一点,直角三角尺的一条直角边经过点A,且60°角的顶点B在BC上滑动（点E不与B,C重合）,三角尺斜边与∠ACM的平分线CF交于点F.（1 一道全等三角形的解答过程已知：△ABC为等边三角形,M是延长线上一点,直角三角尺的一条直角边经过点A,且60°角的顶点B在BC上滑动（点E不与B,C重合）,三角尺斜边与∠ACM的平分线CF交于点F.（1 关于高中英语代词方面的问题Gradually,you will realize that the things that matter are ＿＿that can't be bought with money.A.these B.those C.ones D.some我不懂这"the things that matter are 还有为什么要选B.请尽量详细, 定积分的分部积分法,第7题第一步为什么要提出负号? 大一定积分证明体…求解决! 定积分问题,如题,少了个负号吧? I think my life changed,For example,I used to very short,But now I'm very tall,And I used to have short hair,Now I have long hair,I used to very ouegoing ,Now I'm qhite,As a matter of fact,people sure change.Two years ago,I'm a pimary and secondary s I used to have a large build and I was short.But after a year's exercise I am much taller and thinner.I used to get up late in the morning and stay up late at night.I know it's bad for my health so I get up early and seldom stay up too late.I used to You have changed a lot -------Really?____?--You used to be short and quiet A What B Why C How 一个汽车一杯水一匹马和一个龙是什么成语 一辆车和一杯水的成语 三匹马拉一辆车是什么成语 根据所给词的适当形式填空 1.Look!Your sister ___(do) her homework.2.The students___(have) an English class now.3.It is half past six now.I__(read)Chinese Look!we have ____apple juice nowReally?let's go and some.A.little B.a little C.few D.a few 千里黄云白日曛,北风吹雁雪纷纷.【内容】 谁能解释这个数学问题?a,a^2,a^3,.a^n相加之后是[a^(n+1)-a]/（a-1）这是为什么呢?有什么计算过程来证明? Persons which are currently not involved in other projects than PEPS2 are allowed to close the work不好意思，少了一句，完整的是Persons which are currently not involved in other projects than PEPS2 are allowed to close the work as long a