The manager said that they had an _____ plan if the plan they had submitted was not accepted. A. alternate B.alternative C.absolute D. appreciable 答案:B对一定质量的气体,下列说法正确的是( )A.在体积缓慢不断增大的过程中,气体一定对外界做功B.在压强不断增大有过程中,外界对气体一定做功C.在体积不断被压缩的过程中,内能一定增加D.在与外界没有发生热量交换的过程中,内能一定不变