4.机械波的传播特点 1前带后后跟前运动状态�后传即各质点都做受迫振动起振方�由波源来决定且其振动�率都等于波源的振动�率 Template




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tomski4.机械波的传播特点 1前带后后跟前运动状态�后传即各质点都做受迫振动起振方�由波源来决定且其振动�率都等于波源的振动�率 coloring