The head of the bend is the（）.<br>A:top or upstream beginning of a bend<br>B:bottom or downstream beginning of a bend<br>C:midpoint or center radius of a bend<br>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

出自：海船船员证

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