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The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be___________________?

/ Design of Steel Structures / By
The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be___________________?

A. 4.5 mm
B. 6 mm
C. 8 mm
D. 10 mm