diaphragm preselection ring
前置选择（法）
preselection【计】
暂无补充释义。
相关词条
preselection of tools
function preselection
diaphragm preselection (diaphragm presetting)
preselection of speed, machine tools
preselection【计】
predetermined counter【计】;preselection counter【计】;preset count【计】
preselection counter【计】