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


参考解析

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