题目内容：
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]
参考答案：
答案解析：
选择题：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]
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- 题目类型：选择题
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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]