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1. a 弧之长度为: , _" R# p( T0 [0 A b. 83.7758% x' j, k* [ d+ q( L
2. b 弧之长度为: " w: M8 O4 i5 K& J" U2 V# c c. 60.4600. t# l+ C! z N7 H2 t/ m3 p6 x
3. c 弧之长度为:$ T5 o2 R' V# F
b. 65.53250 h9 D6 T" d3 L- i
4. d 弧之长度为: # v6 c! A1 ~& r3 J; H: a c. 108.6100 ; w$ [* s" O; }1 N5. e 弧之长度为: 6 K' P) U/ V6 u4 s( f9 F; D a. 76.8018 & J- ]. y9 ]4 v2 R T& h8 W6. f 弧之长度为: % A. H9 h& G' u1 X c. 65.4325( l1 @! h8 h4 d+ q9 ^
7. g 弧之长度为: 1 f6 K" }' N6 G6 o b. 126.4051 * m' x1 y# [. v* T7 S4 K' a8. p 弧之长度为: + i# a* Z. X, x0 O a. 117.8097