m/s≤vA≤4 m/s或vA≥5 m/s
m/s≤vA≤4 m/s或vA≥5 m/s
发布时间：2025-07-10 08:36:08
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答案：答案:(1)3 m/s (2)3 m/s≤vA≤4 m/s或vA≥5 m/s
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