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          2020-4-27 xΔ[863]

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          əCđ֪ܶ࣬ԭrϵΠwСˮɻˮ=ˮ/ˮ=ˮ/(+ˮ)

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          əCijLضˮ1%ϣDLͲϵy(tng)60ϵy(tng)5£DLͲϵy(tng)70ϵy(tng)90

          ںəCĹLCgʽӟLCLϵy(tng)LֱӼӟLCLϵy(tng)L1/3ȫ1000-2000LCtȡϵy(tng)LL1.3LC˷ȫȫ5500Pa;LC˷LtCȫ2000Pa

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