A.向正方向偏移 B.向負方向偏移 C.平行移動 D.毫無規(guī)律
A.增加 B.減小 C.不變 D.為零
A.VC=Vh/[1-(ph-Pc)F] B.VC=Vh/(ph-Pc)F C.VC=Vh/(pc-ph)F D.VC=VhF/(ph-Pc)