美国图纸

zhaodelai321

求助以下字母都是什么意思
# w1 h% J# t) dHDNS BR 2.7~3.0
! N! d, E" g- ?  t; SHDNS AT 20 DP FACE A RKW C40 MIN
" k9 n% p* |2 O; v/ IFURNACE TEMPER ONLY
# @/ r$ C! d) n9 i% h# X3 ]- sOPT HDNS PATTERN
4 m! }/ v8 v* Z) I* q  ?: zHDNS BR 2.9~3.4
1 L, U8 M/ k; JHDNS LG H BR 2.7~3.0
9 H+ u# N5 F% n' x5 c- W/ GHDNS AT 20 DP FACE A RKW C40 MIN