A.y=Acos[2πv(t+to)+π/2] B.y=Acos[2πv(t-to)+π/2] C.y=Acos[2πv(t-to)-π/2] D.y=Acos[2πv(t+to)-π/2] A.y=Acos[2πv(t+to)+π/2] B.y=Acos[2πv(t-to)+π/2] C.y=Acos[2πv(t-to)-π/2] D.y=Acos[2πv(t+to)-π/2] 分类:公用设备师 题型:选择题 查看答案