ii. Tap water, heating, air conditioning, hot water, coal gas, lipuefied petroleum gas, naturalgas, methane gas, coal/charcoal products for household use;
自来水、暖气、冷气、热水、煤气、石油液化气、天然气、沼气、居民用煤炭制品；
Proven hot gas generating, air heating, supply air cleaning and exhaust air dedusting systems are available for gas, air and heat supply.
我公司生产的热气发生装置、空气加热装置、供气净化装置和废气除尘系统等均被实践证明为可靠的供气、供热设备。
About 1885, a process by which natural gas heats a roasting chamber and hot air is the only heating medium was developed, and this remains the best and most popular method of roasting coffee.
大约1885年，用天然气加热烘焙箱、以热空气作为唯一的热媒介的工艺就已经被开发了，这种工艺至今仍是最好最普及的咖啡烘焙法。
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