请问什么是NSF61,CSA (fire and smoke ratings) and ASTM B137.11

请问什么是NSF61,CSA (fire and smoke ratings) and ASTM B137.11 Water,Fire,and Smoke water fire and smoke 是谁唱的? sealing pipe penetrations through fire and smoke barriers. 英语翻译I woke up and smelt smoke!A fire!Just then,the fire alar Fire!the alarm rang,smoke filled the corridors and the stude smoke weed and get 请问英语词性Eat more and smoke less FIRE AND ICE怎么样 Fire And Ice 歌词 She smelled a smoke and saw a fire 改错 请把改正后的句子写出来 什么是CSA绿色蔬菜计划