单选题The head of the bend is the().Atop or upstream beginning of a bendBbottom or downstream beginning of a bendCmidpoint or center radius of a bendDcenter line or apex of a bend
单选题
The head of the bend is the().
A
top or upstream beginning of a bend
B
bottom or downstream beginning of a bend
C
midpoint or center radius of a bend
D
center line or apex of a bend
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