This standard is not considering metallurgy factors, such as grain size and hardness.

本标准未考虑冶金方面的因素, 如:晶粒尺寸、硬度.

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The screw was invented in ancient times to carry objects such as grain and water gravity.

阿基米德螺杆是古代的发明,可将谷物及水等东西向上运输.

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Such as grain sheet rubber, it play the role of derrick and inflaming retarding.

如有纹理的橡胶片, 这种材料可起到防滑、阻燃等功能.

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