A.对
B.错
[判断题]A.对B.错
[单选题]A.3B.2C.1D.1或3
[单选题]A.气体对外做正功,向外界放出热量B.气体对外做正功,从外界吸热C.气体对外做负功,向外界放出热量D.气体对外做正功,内能减少
[单选题]A.减速并鸣喇叭提示B.交替变换远、近光灯提示C.加速通过D.持续鸣喇叭催促
[单选题]A.B.C.D.