“free air temperature range”指的是什么参数?

air free operating free-air temperature range的中文? “free air temperature range”指的是什么参数? air air air 英语翻译free your imagination on the elements of food,water and air Free free free free free free free Free 帮我看看这个小作文怎么写,1、a supermarket and a free market2、Air travel and automobile travel 英语 be free of 和 be free from比如They focus on keeping their soil rich and free of diseaseThis keeps the air ,water free from chemicals1 这两句的意义上没什么区别吧 ? 另外 2 第一句free 前面为何用and ? free of disease是 We once thought of water and air as free.They're not,not any more than the land is free.这句话我看不懂了：They're not,not any more than the land is free.