短語詞組短語constant -extinction-angle measurement 關斷角測量critical extinction angle 臨界熄弧角constant extinction angle 逆變側定熄弧角extinction angle control 熄弧角控制apparent extinction angle 眡在熄弧角constant extinction angle control 恒熄弧角控制symmetrical extinction angle 對稱消光角real extinction angle 實際熄弧角minimum extinction angle 最小關斷角 返回 extinction angle