Ball-point pen in English:ballpen is popular the world over the past few decades as a writing tool.It has simple structure,easy to carry,writing lubrication,and is suitable for replication,etc.,and therefore,from school students to the office of civilian personnel all walks of life are happy to use.Ball-point pen and fountain pen is different because it uses dry thick of ink,ink pen is also relying on the free rotation of the ball with his head out of turn wrote the paper,therefore does not leak,not climate effects,and writing a longer time,eliminating the need to ink the regular infusion of trouble.
最新问答: 关于苯环溴化的问题小弟有几个关于有机化学的问题为什么苯酚对位溴化可以不用催化剂水杨酸甲酯可以么?我用的同苯酚溴化的方案, 化学物质BPO是什么?BPO是什么化学物质呢? 短文改错 There are so much road accidents every day .They are of 英语翻译Student AssessmentAcademically,某某 has a solid foundation 灯泡的灯丝用钨制成,是因为钨的什么 选字填空.(1)[ 选字填空.(1)[形 型 行] ( )态 模( ) ( )为 (2)[须 需] ( 半命题作文 风雨中我{ }800字左右 有叙事 语言优美 有环境描写 快啊 请问一下谁知道 JCUV R/T, 已知幂函数y=(-m^2-2m)乘x^(m^2-2m-1).当x属于(0,正无穷)时为增函数,求m的值 半命题作文怎么写 下列哪一项不是人口增长过快产生的危害( ) A.生态环境遭到危害 B.制约社会发展 C.加快人口老龄化 D.造成资源危 形容一个人只会做表面功夫,随口说说,并不实际的英语单词或者词组或者俚语有哪些? “得”字带头的成语有什么 定义在实数集R上的单调增函数y=f(x)的图像与x轴至多只有1个公共点 water前面可不可以加a我想知道water前可不可以加a I bought a and a ruler in the shop. A.hen B.pet C.ten D.pen 前两个 英文怎么说 有一列数字按照一定规律排序,1 -3 9 -27 81 -243……其中某三个相邻的数的和为-189,这三个数各是多少 有一批水果,用大筐80只可装运完,用小筐120只也可装运完.已知每只大筐比每只小筐多装运20千克,那么这批水果有多少千克 1.一张长方形纸片,长10厘米,宽8厘米.在这张纸片上剪去一个最大的圆后,剩下部分的面积是多少平方米?