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发表于 2010-2-10 15:06:14 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
51.One variety of partially biode gradable plasticb everage containe rismanu facture dfrom small bits of plastic
boundtogetherbyadegradablebondingagentsuchascornstarch.Sinceonlythebondingagent
degrades,
leavingthesmallbitsofplastic,nolessplasticrefusepercontainerisproducedwhensuchcontainers
are
discardedthanwhencomparablenonbiodegradablecontainersarediscarded.

Whichofthefollowing,iftrue,moststrengthenstheargumentabove?

(A)Bothpartiallybiodegradableandnonbiodegradableplasticbeveragecontainerscanbecrushed
completelyflatbyrefusecompactors.

(B)Thepartiallybiodegradableplasticbeveragecontainersaremadewithmoreplasticthancomparable
nonbiodegradableonesinordertocompensatefortheweakeningeffectofthebondingagents.

(C)Manyconsumersareecology-mindedandprefertobuyaproductsoldinthepartiallybiodegradable
plasticbeveragecontainersratherthaninnonbiodegradablecontainers,evenifthepriceishigher.

(D)Themanufacturingprocessforthepartiallybiodegradableplasticbeveragecontainersresultsinless
plasticwastethanthemanufacturingprocessfornonbiodegradableplasticbeveragecontainers.

(E)Technologicalproblemswithrecyclingcurrentlypreventthereuseasfoodorbeveragecontainersofthe
plasticfromeithertypeofplasticbeveragecontainer.

不太理解B的tocompensatefortheweakeningeffectofthebondingagents 的意思,这个有什么密切关联呢?

我想法 A=X+bonding agent ,X ---> X'       &      B = Y  , Y  --->Y' ,
            X' ≥ Y'   ---> X ≥Y
(这里 A : Bio-- container  B : Non bio --- container   X = Y: plastic  X' = Y': plastic refuse  )
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沙发
发表于 2010-6-2 17:31:31 | 只看该作者
这么久了
就是说 部分降解的饮料罐中的不可降解部分塑料仍然会污染环境 所以没什么用 只有可降解部分降解了 答案说不可降解部分的塑料量更大 所以strengthern the topic
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