中职第三学期日语听力试卷A
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中职第三学期日语听力试卷A 广西华侨学校2011-2012上学期 10级商务日语班《日语听力》期考试卷(A) 考试方式:闭卷 出题:咸舒瀚 评卷:咸舒瀚 姓名 班级 分数 一、听录音选出正确答案。(30分)(放2次录音) Diluted with water to scale this solution per ml is equal to 1. O µ g of arsenic. 11 instrument 11.1 spectrophotometer. 11.2 measuring arsenic device: see Figure 1, wet digestion method in repeatability conditions of the absolute value of the difference of two independent measurement results shall not exceed the arithmetical average of the 10%. 11.2.1100mL~150mL an Erlenmeyer flask: 19th standards. 11.2.2 tubes: tube 19th, after alkali treatment, or wash the rubber plug secret contacts with the Erlenmeyer flask timely should not leak. The other end of the tube diameter is 1. Omm。 11.2.3 absorption tube: 10mL graduated centrifuge tube for absorbing work. 12 sample processing 12.1 nitric acid a perchlorate a sulfuric acid method 12.1.1 food, and fans, and •, and bean dry products, and pastry, and tea, and he containing water less of solid food: said take 5.Oog or 10.00g of crushed sample, placed 250mL~500mL set nitrogen bottle in the, first added water little makes wet, Addend grain glass beads, and 10mL~15mL nitric acid-perchlorate mixed liquid, placed moments, fire slowly heating, stay role ease, put cold. Along the wall to join 5mL or 10mL acid, then heated until liquid in a bottle when you begin to turn brown, continue along the wall drops mixed with nitric acid perchloric acid solution to the complete decomposition of organic matter. Increased firepower to produces white smoke, bottle of white smoke after taking NET, 1 bottle liquid smoke to be digested completely, with the clarity solution should be colorless or slightly yellow, cool. (In operation should be taken to prevent bump or bang) and 20mL of water to a boil, remove residual nitrate up 本文来源：https://www.wddqw.com/doc/e5c7d07ad2d233d4b14e852458fb770bf68a3b14.html