Experience to data has shown that at distances of up to 20 km from mine sites,it is desirable to kno – Chinese translation

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Experience to data has shown that at distances of up to 20 km from mine sites,it is desirable to know details of temperature and wind velocity at levels up to 900 meters

迄今的经验表明、在距矿场20公里的范围内、需要知道900米高空温度和风速的详细情况

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