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Which of the following E-mail subjects is better? ( ) A. Subject: Computer B. Subject: Complaints C. Subject: Monthly Safety Meeting on Dec. 20 D. Subject: Work proposal

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7月初，某期货风险管理公司先向某矿业公司采购1万吨铁矿石，现货湿基价格665元/湿吨(含6％水分)。与此同时，在铁矿石期货9月合约上做卖期保值，期货价格为716元/千吨。此时基差是（　　）元／千吨。(铁矿石期货交割品采用干基计价，干基价格折算公式=湿基价格／(1-水分比例))
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