发布时间:2025-01-31 04:32:24
半径为12.56÷3.14÷2=2m
体积为π×2^2×2=8π 立方米
可以盛稻谷8π×600=4800π≈15079.64千克
我在车上装了一个四声道功放每个声道一个喇叭现在我想装一个低音炮低音炮是无源的请问我需要高转
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