C 4 Spec t r a M e a s u r e d at Aft A n g l e s O v e r a S e a l e d A s p h a l t S u r f a c eat the P & W A T e s t F a c i l i t y
标准号：AIR1672
标准名称： Practical Methods to Obtain Free-Field Sound Pressure Levels
from Acoustical Measurements Over Ground Surfaces
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