13春学期《冶金学(二)》在线作业3（13 spring semester metallurgy (two) online homework 3）.docVIP

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13春学期《冶金学(二)》在线作业3（13 spring semester metallurgy (two) online homework 3）.doc

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13春学期《冶金学(二)》在线作业3（13 spring semester metallurgy (two) online homework 3） 14 Northeastern University spring 13 autumn East 13 spring semester metallurgy (two) online homework 3 Total score: 100 test time: - Radio examination A multiple-choice question Judgment question Radio examination questions (8 questions, 32 points) 1. when the molten steel cools, the primary inclusions, which are separated by the decrease of the solubility product, are called () A. an inclusion B. two inclusion C. three inclusion Full marks: 4 2. crude four titanium chloride in a wide variety of impurities, VoCl3 belong to what kind of impurities as follows? A. high boiling impurities B. low boiling impurities C. boiling point similar impurities D. solid impurities Full marks: 4 3. there are fine pores in the cross section of the slab. These pores are called porosity. The pores dispersed throughout the cross section are called () A. dendrite loose B. generally loose C. center porosity Full marks: 4 4. the process of removing trace lead and zinc by nickel is (and) ion exchange and extraction. A. substitution method B. coprecipitation method C. chlorination hydrolysis method D. oxidation hydrolysis method Full marks: 4 5. generally in the distance from the billet surface 20mm, and the surface of the small vertical cracks are called (). A. down crack B. subcutaneous crack C. straightening crack D. center crack Full marks: 4 In the process of alumina production by 6. sintering process, which of the following is the ratio of calcium in the proportioning of raw slurry? A. molecular ratio of calcium oxide to alumina and iron oxide B. molecular ratio of calcium oxide to alumina C. molecular ratio of calcium oxide to alumina and silicon oxide D. molecular ratio of calcium oxide to silicon oxide Full marks: 4 7.1971 years, Japan special steel company developed the use of basic synthetic slag, submerged arc heating, argon blowing, refining in the reduced atmosphere () method. A. CLU method B. CAS method