i ii iii meaning in English

等多种其中膜联蛋白
极品之选监听版
纪念号
如分为

Standard for safety for intrinsically safe apparatus and associated apparatus for use in class i , ii , iii , division 1 , hazardous classified locations
在i ii iii级1区危险场所使用的内在安全装置和附属装置的安全标准
Three compact disks entitled , " path of legendary love i , ii , iii " that include poems written by dinh hung and vu hoang chuong , and recited by supreme master ching hai
步入情史i ii iii的三片cd ，由清海无上师吟唱丁雄和武煌璋的诗作。