1)3k cosmic blackbody radiation,3k 宇宙黑体辐射2)integers of the form 3~k+p~α,3k+pα型整数3)three degree background radiation,3K背景辐射4)K type planetary gear trains,3K行星齿轮系
用法和例句
The 3K type planetary gear trains are the important aid units in the transmission systems.