In fact, the industry now supplies 370 different types and styles in more than 70 different colors and in 18 degrees of hardness.
事实上，工业界现在提供着370种不同种类不同风格、超过70种不同颜色、18种不同硬度的铅笔。
Applications of black Cr plating, different types of baths and the secondary additives used, and relationship between blackness and hardness of the coating have been summarised.
概述了黑铬镀层性能、黑度与硬度关系，目前出现的工艺类型、辅助添加剂和镀层应用等状况。
In fact, the industry now supplies 370 different types and styles in more than 70 different colors and in 18 DE GREes of hardness.
事实上，工业界现在提供着370种不同种类不同风格、超过70种不同颜色、18种不同硬度的铅笔。
In fact, the industry now supplies 370 different types and styles in more than 70 different colors and in 18 DE GREes of hardness.
事实上，工业界现在提供着370种不同种类不同风格、超过70种不同颜色、18种不同硬度的铅笔。
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