---Stay a bit longer, please. It’s been such fun having you here. ---Thank you, but I’ve got early start tomorrow morning. A./; the B.a; an C./;an D.the; an 答案:C6.质量为2kg的某种物质温度从20℃升高到40℃时,吸收的热量是1.68×104J,该物质的比热容是4.2×103J/(kg•℃).如果不考虑热量散失,需要完全燃烧1.4×10-3kg干木柴来提供这些热量.(q木柴=1.2×107J/kg)