�率越高的声波在传播过程中方�性越好力量越强现代声纳技术就是利用�率很高的超声波制成探测器.声波探测器利用它的回波声可探测海中的冰山 Template




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tomski�率越高的声波在传播过程中方�性越好力量越强现代声纳技术就是利用�率很高的超声波制成探测器.声波探测器利用它的回波声可探测海中的冰山 coloring