【进阶级练习题60】* M# l' m0 ]' |" u: J
7 S! ^! ^$ _9 H2 p% O8 B8 b- f3 c
求:# u( M% A3 N( v
1. a 之长度为何?$ K8 k2 g. y: U
a. 13.0115 b. 13.0151 c. 13.0511 2 ?, A# g; K" q, {: l( J* i. }2. 剖面线区域之面积为何?, `* A. C8 F4 w* v* u) Q1 F4 }
a. 194.2153 b. 194.2351 c. 194.2513