名词解释题撞击声压级impact sound pressure level
名词解释题
撞击声压级impact sound pressure level
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相关考题：
In the following statements about the principle of the low level controlling, which is WRONG? 0 A.Low level is monitored on the drain tank and header tank.B.If there is high differential the filters pressure across the circulatingpumps is alarmedC.The lubricating oil purifier cannot take oil from the drain tankD.If the sea water pressure falls, this also operates an alarm
A ______ is created by a pressure gradient or slope in the water level．A.gradient currentB.density currentC.swift currentD.torrent current
各倍频带声压级经能量叠加法求得的和为总声压级。根据《环境影响评价技术导则一声环境》，同一噪声源在相同位置、相同时段测得的评价量中，大小关系必定成立的是()。A:总声压级≥A声级B:A声级≥总声压级C:总声压级≥各倍频带声压级D:A声级≥各倍频带声压级
各倍频带声压级经能量叠加法求得的和为总声压级。根据《环境影响评价技术导则 声环境》，同一噪声源在相同位置、相同时段测得的评价量中，大小关系必定成立的是（ ）A.总声压级≥A声级B.A声级≥总声压级C.总声压级≥各倍频带声压级D.A声级≥各倍频带声压级
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单选题以下关于声压级（SPL）的说法正确的是（）。A声压级是指声压与参考声压的比值B声压级是指声压与参考声压的比值取常用对数后的值C声压级是指声压与参考声压的比值取常用对数后乘以10的值D声压级是指声压与参考声压的比值取常用对数后乘以20的值
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单选题The pilot of the plane which flies faster than sound travels does not hear the thunderclaps because______.Athe sound of plane engine travels slower than the planeBthe frequency of the sound altersCthe passage does not mention itDthe pressure decreased when the plane flies in the air