单选题Under the forces of its own weight，the suspended length of line will fall into a shape known as a（）.ApolygonBholding arcCcatenary curveDparabolic curve
单选题
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
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