根据建筑空调用能的特点，结合现代空调热泵技术分析城市中未利用的自然能源、废热排热等低品位能源的应用问题。
The Paper Discussed the applying Renewable Energy and Unutilized Energy occurred in City for HVAC System of Buildings by Heat pump technology.
用跳汰机对低品位锡矿进行粗粒抛废处理是一种选矿新工艺，其技术先进。
It is a new ore dressing process to separate low grade, coarse-size Tin ore by jig, and it is advanced technology.
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