channel section溝形鋼[化学]; みぞ形断面[機械]channel (type of section steel): channel (type of section steel)溝形鋼みぞがたこうchannel control section: チャネル制御部｛せいぎょ ぶ｝channel section material: channel section material溝形鋼[化学]; 溝形材[化学]
