Well-known industry author and instructor Jim Johnson is offering a new video for technicians who want to sharpen their troubleshooting skills. "This HVAC training video program, is available in DVD ...
Well-known industry author and instructor Jim Johnson is offering a new video for technicians who want to sharpen their troubleshooting skills. "This HVAC training video program, is available in DVD ...
Abstract: Penguin colony detection is an important part in Antarctic research and is significant for global ecological conservation. Meanwhile, the emperor penguin (Aptenodytes forsteri) urgently ...
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