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06/09/16 09:44:01Structural steel is about 98 percent iron alloy and available in a wide range of grades. These grades are grouped together based on properties such as strength, malleability, corrosion resistance, cost, and welding capabilityMình không tìm đc nghĩa nào hợp lý cho từ "grade" cả. Ai giúp mình với.Lu Nguyen Van đã thích điều này-
1 · 06/09/16 12:02:14 -
0 · 07/09/16 06:55:10
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