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原帖由 frankie172002 於 27-4-2008 16:04 發表
佢俾個答案
第一條:A
第二條
第三條:C
第一條點解唔係二氧化硫?
第二條燒聚氯乙烯果陣會有二氧化硫同微粒?
第三條個答案唔係應該係A or B咩?
Puppet 都有錯ge時候[[tk_02]] impossible
2.Burning of PVC ,PVC are large molecules...therefore, carbon soot may evolve... SO2 -0-.... I dun think SO2 is evolved unless the PVC is impure...
3. Glass is easily scratched...and for B...it is definitely wrong... |
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