1 . Noise control materials can be tested in terms of sound ________ (absorb). (所给词的适当形式填空)
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20-21高三上·黑龙江哈尔滨·期中
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2 . Both scattering and_____ (absorb) of light make an object look different from other objects around it, so you can see it easily. (所给词的适当形式填空)
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