• 2022-07-26
    已知:洋山于近似看 作球, [tex=3.143x1.0]psdRef5gjwQYt/1flDqT4ZOLhgwGq4NE9tkcl3MMEYI=[/tex], 初温为 [tex=2.143x1.071]8LIofHN9OwL+t1Gb0rx/gjfLy7Qi9Fyr5VCI3TePFlU=[/tex] , 物性近似取 [tex=2.143x1.071]8BW2l86mrdNYuUAgFlwnjbc1pRI2Fmijo1JnRR/4Y8I=[/tex] 水的值, 灯箱温度 [tex=12.0x1.571]mdcCjug04zq8koj9wCBUEBs7kkM/36I7m/aDcb7M9A4lmIn4OhK0P716jWMW2rUG41k9pxNUqMEpIYHOR4W+Z9UM14CwvXCqjR82yXLDm2syE86Ck3KezvOOF8hjybGoRaHmPRN6JsTHEoiulpcEWw==[/tex].求:20min后山于中心的温度。 
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