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- The research improvement for the synthesis of acetophenone by ethylbenzene selectively catalytic oxidation using hydrogen peroxide or molecular oxygen as clean oxidant is described. 摘要叙述了近年来使用双氧水和氧气作为清洁的氧化剂,乙苯选择性催化氧化合成苯乙酮的研究进展。
- Test results showed that the optimized pickling process could clean oxide skin of weld surface in effect and improve pitting-resistance property greatly. 研究结果表明,采用本文中的酸洗工艺可以有效清除不锈钢焊缝表面的氧化皮,并改善其耐点蚀性能。
- Clean clothes and good manners are prepossessing. 清洁的衣服和良好的举止能给人以好感。
- Advances in cleaner oxidation of alcohols by molecular oxygen instead of stoichiometric oxidants in supercritical carbon dioxide are introduced according to the catalytic systems. 摘要本文以催化剂体系为主线,介绍了超临界二氧化碳中以分子氧代替化学计量氧化剂的醇类清洁氧化技术的研究进展。
- Let's clean down the board before we paint it. 让我们在上漆以前把这块板洗干净。
- It's important for the college freshman to keep his nose clean. 对大学新生而言洁身自好是很重要的。
- He is surprised to find his room thoroughly clean. 他惊讶得发现他的房间给彻底地打扫了。
- I use an oily rag to clean my bike with. 我用沾满油污的碎布擦我的自行车。
- I was clean broke in less than four days. 不到四天我就一个钱也没有了。
- The mayor is determined to clean up the city. 市长决心清除市内的不良现象。
- The stain on his shirt is difficult to clean off. 他衬衣上的污点很难去除掉。
- The hospital is getting short of clean linen. 这所医院现在缺少乾净的被服用品。
- Clean the car from the top, preferably with a hose and warm water. 最好用软管和温水从顶部开始清洗汽车
- I suggest we make a clean break. 提议我们干干净净分手吧。
- A sharp knife makes a clean cut. 快刀切得整齐。
- He made a clean breast of his crime to the police. 他向警方如实招供。
- A good clean will really freshen (up) the house. 好好收拾一下的确会使房子焕然一新。
- It looks as if it isn't clean enough to bathe here. 看起来海水好像不干净,不能游泳。
- He didn't clean the room yesterday. 他昨天没打扫房间。
- Clean the area round the cooker. 把炊具周围弄干净。