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当前学科：浮选工考试
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通过人体的安全交流电流应在（）mA以下。
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Make a non-firm offer after reading the following given letter of initial inquiry． Dear Sirs, We have learned from Smith and company of Birmingham that you manufacture a range of high-fashion handbags in a variety of leathers. We operate a quality retail business and although our sales volume is not large, we obtain high prices for our goods. Would you please send me a copy of your handbag catalogue with details of your prices and payment terms? We would find it most helpful if you could also supply samples of the various skins from which the handbags are made. Yours faithfully,
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