波源在坐标原点处某时刻波刚好传播到a点波形如图所示.若从该时刻开始计时1s时b点第一次出现波谷下列说法正确的是 A.波源刚开始 Template




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tomski波源在坐标原点处某时刻波刚好传播到a点波形如图所示.若从该时刻开始计时1s时b点第一次出现波谷下列说法正确的是 a.波源刚开始 coloring