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单词
sound level calibration instrument
释义
sound level calibration instrument
娚缎W计[ 由稳定振荡器、赫姆霍兹(Helmholts)共振腔、电声换能器和耦合腔组成。在]
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city (water) main
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city water tank
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更新时间:2026/8/8 20:33:06