例句與用法

1. Mdi testing methods for polymethylene polyphenyl polyisocyanate testing methods for polymeric mdi
   聚甲烯聚苯聚異氰鹽酸的測(cè)試方法
2. Application of polyphenyl insulating plate for frost protection of hydraulic project foundation
   聚苯保溫板在水利工程基礎(chǔ)預(yù)防凍害中的應(yīng)用
3. Occupational exposure limit for polymethylene polyphenyl isocyanate in the air of workplace
   車間空氣中多次甲基多苯基多異氰酸酯職業(yè)接觸限值
4. A novel ring - enlargement oxidation of polyphenyl substituted cyclopentadienes in air ( or molecular oxygen ) promoted by perchloric acid was described , in which an oxygen atom was inserted into the cyclopentadiene - ring , forming a six - membered pyrylium salts
   摘要報(bào)導(dǎo)了空氣（或氧氣）存在的條件下，由高氯酸引發(fā)多苯基取代環(huán)戊二烯發(fā)生新穎的碳碳鍵斷裂擴(kuò)環(huán)反應(yīng)，在此反應(yīng)中，氧原子插人到環(huán)戊二烯環(huán)中形成相應(yīng)的六元環(huán)吡喃鹽類化合物。