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In the week of November 5th-9th, the indexes of the Shanghai and Shenzhen stock markets went down 8.00% and 7. 56% respectively, in response to the publicly trading of the 4 billion new shares of PetroChina Company Ltd on November 5th. And some analysts thought the deep drop was caused by global stock markets and the US home loan crisis (or the crisis of subprime mortgage loans). The stock price of Hualu-Hengsheng Chemical (SH: 600426) suffered a drop of 39.3% weekly, hit the biggest drop. The stock price of Sinopec Corp. (600028) dropped 18%, ranked the third place.