焊接电子部件还会产生有害气体，但管理人员拒绝打开通风设备，安全检查人员在场的情况下除外。
The welding of electronics parts also produces toxic gases, but management refuses to turn on the ventilation system, except when safety inspectors are present.
通风系统由送排风机、风道、风道部件、消声器等组成。
Ventilation system by sending the exhaust fan, duct, duct parts, muffler etc.
为整个制冷，空调，通风或热泵系统维修和更换零部件。
Repair and replace parts and components for entire refrigeration, air conditioning, ventilation or heat pump systems.
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