(2nd LD) BOK holds key rate steady despite signs of sluggish economy

(ATTN: UPDATES with remarks from BOK governor, additional information in paras 6-9, 15-19; RESTRUCTURES; ADDS additional photo) By Byun Duk-kun SEOUL, March 10 (Yonhap) -- The Bank of Korea (BOK) left its key rate unchanged Thursday, again extending