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在波 h(t) = 3 sin(2pi t/12) m(潮汐)中,在 t in [0, 12] 的哪个时刻高度为 1,5 m?
在波 h(t) = 3 sin(2pi t/12) m(潮汐)中,在 t in [0, 12] 的哪个时刻高度为 1,5 m?
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