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Wang Shizhang
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Wang Shizhang
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Wang Shizhang
王世章
(1923-09-01~2016-09-05)中国合金钢专家。中国高速工具钢科学研究与生产领域的带头人之一,中国节约镍铬型的含硼合金结构钢、超高强度钢和半奥氏体沉淀硬化不锈钢的开拓者之一。
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number three in palace examination
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number π
number π; ratio of the circumference of a circle to its diameter
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