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随便看	attenuation compensator attenuation-- connectors attenuation constant attenuation correlation method attenuation cross-section attenuation curve attenuation cutoff wavelength attenuation dawing attenuation dead zone length attenuation decrement attenuation; differential attenuation distance attenuation distortion attenuation drawing effect attenuation effect attenuation-- energy attenuation equalization attenuation equalizer attenuation equalizers attenuation; equal probability attenuation equilizer attenuation equivalent attenuation equivalent nettiness attenuation factor attenuation--factor