A.Cv B.Cp C.Cv/Cp D.Cp/Cv
A.P1=P0+U1/2;P2=P0+U2/2 B.P1=P0-U1/2;P2=P0-U2/2 C.P1=P0+U1;2=P0+U2 D.P1=P0-U1;P2=P0-U2
A.90度 B.180度 C.360度 D.30度