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撞击声压级impact sound pressure level
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In the following statements about the principle of the low level controlling, which is WRONG? 0
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A ______ is created by a pressure gradient or slope in the water level．A.gradient currentB.density currentC.swift currentD.torrent current
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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
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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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在计算噪声从室内向室外传播噪声衰减时，会使用到()，当该声压级难以测量时，将使用（）计算。A:A声级；等效连续A声级B:倍频带声压级；等效连续A声级C:总声压级；倍频带声压级D:倍频带声压级；A声级
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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A（）is created by a pressure gradient or slope in the water level.A
gradient currentB
density currentC
swift currentD
torrent current
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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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a floating ball
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单选题A pump is defined as device that（）A
produces pressureB
imparts energy to a fluid to move it from level ‘A’ to level ‘B’C
creates a vacuum to move a liquid in all installationD
is to develop a pressure differential
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单选题Decibel is______.A
the unit for measuring the intensity of soundB
the pressure of radiating wavesC
the frequency of radiating wavesD
the seed of sound
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rise when the steam pressure is increasedB
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单选题The pilot of the plane which flies faster than sound travels does not hear the thunderclaps because______.A
the sound of plane engine travels slower than the planeB
the frequency of the sound altersC
the passage does not mention itD
the pressure decreased when the plane flies in the air
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