In various regions, different test gases are usually necessary to insure the quality, safety device and thermal characteristics of wall hung gas boiler.
为保证壁挂锅炉的质量，检测其安全装置和热工性能是否达到要求，需要根据不同地区的气源进行配气。
In various regions, different test gases are usually necessary to insure the quality, safety device and thermal characteristics of wall hung gas boiler.
为保证壁挂锅炉的质量，检测其安全装置和热工性能是否达到要求，需要根据不同地区的气源进行配气。
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