摘要:Why was the woman at the airport? A.She was sraveling on business. B.She was seeing the man off. C.She was leaving for Greece.
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物体在常温下的温度变化可以用牛顿冷却规律来描述:设物体的初始温度是T0,经过一定时间t后的温度为T,则T-Ta=(T0-Ta)•(
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,其中Ta称为环境温度,h称为半衰期.现有一杯用88°C热水冲的速溶咖啡,放在24°C的房间,如果咖啡降到40°C需要20分钟,那么此杯咖啡从40°C降温到32°C时还需要多少分钟?
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