Thanks, It is very educational.... 2 C; x$ G: V7 n( x9 t3 There is a link you can read the drawings ; Y5 w( A+ \# T: \) B: S * v& c( n- {. T5 d. r0 k1 u, a, nhttp://www.dfg.cn/gb/zjjy/7/zjjy-7-1.htm 7 R, W9 J6 ]1 `, \! D% B k5 A& Y 6 d3 N* M* B" |6 z& Q* P6 G" U7 N[ 本帖最后由 rockylily 于 2006-12-21 13:52 编辑 ]