第三步，检查空调主机的操作系统。
Third step, check the operating system of air conditioning system.
在某大型商场的筹建过程中，选择使用电、气双能源的中央空调主机。
During preparing to construct a mall, dual energy source (both with electricity and gas) was choosed for central air conditioning unit.
近年来，我们的客户遍布世界各地且皆为世界知名的冷冻空调主机厂与空压机厂。
In recent years, our customers are located all over the world and many of them are internationally known makers.
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