A common class of wire rope used for mooring is the 6x19 class. What does the 6 represent?()
A. Factor of safety
B. Number of wires per strand
C. Number of strands per wire rope
D. Number of wires in the core
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中国四大菜系位居榜首的是()
A. 川菜
B. 粤菜
C. 湘菜
D. 苏菜