问题
单项选择题
Under the forces of its own weight，the suspended length of line will fall into a shape known as a（）.
A.polygon
B.holding arc
C.catenary curve
D.parabolic curve
答案
参考答案：C
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Under the forces of its own weight，the suspended length of line will fall into a shape known as a（）.
A.polygon
B.holding arc
C.catenary curve
D.parabolic curve
参考答案：C