66 Sound level meter 的 A, B, C network 是為了配合人類的 loudness phone curves, C-weighting(dBC)主 要是模擬:
(A)40-phone curve
(B)70-phone curve
(C)high loudness level curve
(D)任何 curve

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統計: A(10), B(6), C(24), D(2), E(0) #1077623