工机可以制造具有特殊功能要求的机器,如机房停电后保持启动状态,呼叫后自动恢复。这台机器是由制造商制造的,是工厂意义上的工程机器。就空调类型而言,T3气候被广泛应用于中国,即制冷时温度不高于42度,制热时温度不少于零下5度。但现在很多品牌空调的使用指标都高于这个标准。
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