$ N& K: N, F p$ y8 {單式彎紗single sinking
8 P6 s0 m; f0 q& w, \5 \2 t復式彎紗sinking and dividing 有回退式彎紗sinking with robbing
8 x L+ f9 t* U2 v p9 y無(wú)回退式彎紗sinking without robbing 夾持式彎紗sinking with clamping
4 N$ {: {2 }- \5 I+ i5 Z1 Q非夾持式彎紗sinking without clamping
8 _* p1 g' H" m1 G* ~; f5 {, ]" C% r" J1 ?6 R: x
" y' T+ s( O" r7 M' R9 C
e- m2 R; r; F* O0 d" q. `1 K5 Z# a
: J B' n& G' G/ @+ ~( Q, E; `' J" O V1 w+ v8 t
: J5 D @5 l) H
8 K) z g* H% Q$ k% o; S( l |