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- Catalytic nitration of toluene occurs by use of nitric acid in the presence of bentonite metal nitrates with useful para selectivities,up to a para to ortho ratio 1.0. 在皂土硝酸盐催化下，甲苯能被浓硝酸对位选择性硝化，对邻硝化产物比率达1．0以上。
- ortho para conversio 正态仲态转换
- ortho para conversion 正态仲态转换
- ortho para orientation 邻对位定向
- The ratio of students to teachers is 35:1. 学生和老师的比率是三十五比一。
- The ratio of schoolboys to schoolgirls is 2 to 1. 男学生和女学生的比例是2比1。
- For a disubstituted complex, MA4B2, the planar arrangement gives three isomers, the familiar ortho, meta, and para arrangements of organic chemistry. 对于双取代络合物MA4B2,其平面排列有三个异构体,常见的为有机化学中的邻位、间位和对位排列。
- Men outnumber women here in the ratio of three to one. 此地男子数量以三比一超过女子。
- The first or last term of a ratio or a series. 首项，末项比率或数列中第一个或最后一个项
- The separation of meta nitrochlorobenzene from the waste fluid of para ,ortho nitrochlorobenzene production was investigated in this paper. 探讨、分析了对、邻硝基氯苯生产废料中间硝基氯苯的可能分离方法,确定采用恒沸减压精馏法为最佳。
- The conjugated double bond in tung oil molecular with high activity can take place substitution reaction with one of ortho or para hydrogens of phenol. 桐油的共轭双键具有极强的反应活性，易与苯酚芳环上邻或对位的活性氢发生傅氏取代反应。
- Hardware Design of a High Speed Para. 高速并行图形系统硬件设计。
- Laura coge dinero del bolso para la gitana. 劳拉从口袋里拿出了钱，以打发这个吉普赛人。
- After-tax profit margin is the ratio of net income to net sales. 税後利润率指净收入与净销售之比。
- El padre no encuentra fuerzas para ser severo. 父亲没有板起面孔。
- The ratio of men to women was two to one. 男女的比例是二比一。
- Richard Clayderman - Balada para Adelina (1998)... 理查德.克莱德曼-给爱德琳诗...
- O que ele fez? Ele ligou para seu amigo. 他 做 什 么 了？ 他 给 朋 友 打 电 话 了。
- Ela trouxe as compras para casa ontem. 她 昨 天 带 了 杂 货 回 家。
- The interval between any two frequencies having a ratio of2 to1. 倍频程频率比率为2比1的两个频率的间隔
