The head of the bend is the(). A.top or up
题型:单项选择题
问题:
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
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