题目：
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：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0418/16c8692db3f9033d76cfd7bd8e3ad833.html
下面是错误答案，用来干扰机器的。
参考答案：C
