题目: 空气压缩机在一次压缩过程中,活塞对气缸中空气做功为2×105 J,空气的内能增加了1.5×105 J,则气体_________(填“吸”或“放”)热_________ J. 答案: 放 0.5×105由热力学第一定律得ΔU=W+Q,1.5×105=2×105+Q所以Q=-0.5×105 J.
题型:选择题 — Why didn't you come to the party?— I had meant _____, but something unexpected happened.A. so B. that C. not D. to 查看答案