,X遇明火会剧烈燃烧,下列相关说法中错误的是( )
C . X是有机化合物
D . CaC2中钙元素的质量分数为62.5%
d,导线框始终以恒定速度v水平向右运动。右边空间中有以MN为边界、磁感应强度为B的匀强磁场,磁场方向垂直导线框平面,边界MN和导线框的水平边成60°角,不计导线框中电流产生的磁场,求
水平轨道AB与半径为
的四分之一竖直圆轨道BC相切于B,轨道BC与半径为
的四分之一竖直圆轨道CD相切于C,质量为
的小球静止在A点,现用水平恒力F向右拉小球,在到达B点时撤去拉力,小球恰能通过D点。已知
, 不计一切摩擦及空气阻力,计算结果保留根号,求:
=3
C . y=6x+1
D . xy=2
—________________
How many people from the meeting last Friday?
①调动多方主体积极的参与村务治理,推进村民自治的有效实现
②提高行政管理效率,切实保证人民群众依法直接行使民主权利
③丰富村民自治的实践形式,拓宽公民参与国家事务管理的渠道
④发扬社会主义民主,提升基层群众自治组织乡村社会治理能力
.
假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的短文。短文中共有10处错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏词符号(∧),并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下画一横线,并在该词下面写出修改后的词。
注意:1).每处错误及其修改均仅限一词;
2).只允许修改10处,多者(从第11处起)不计分。
On January 5th, students in our school visited Robot World, which we saw a great diversity of robot. I was amazing to find those robots could do a great number of things just like real people, included playing chess, playing the piano and drawing pictures. What's more, the robots were in different kinds and shapes, which made us enjoyable. In addition, that excited me most is the show given by a group of robots. They danced just as if they were dancers on the stage. By visiting Robot World, I have learned a lot of about robots, especial about their functions and shapes. The great human wisdom is so powerful that it make us feel more comfortable live in the world.
—Listen, Donna. You late to work too many times. You're fired.