A.对外做正功
B.内能增加
C.从外界吸热
D.向外界放热
[单选题]A.对外做正功B.内能增加C.从外界吸热D.向外界放热
[单选题]A.have more sources of revenueB.have more balanced newsroomsC.are less depe
[单选题]A.A的线速度比B的大B.A与B的向心加速度大小相等C.悬挂A、B的缆绳与竖直方向的夹角相等D.悬挂A的缆绳所受的拉力比悬挂B的小
[单选题]A.played a role in the spread of popular cultureB.became intimate shops for