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avia. 分组检查
busin. 分组校验
IT 块校验
tech. 块检验; 棋盘格纹饰
textile 棋盘格纹; 方格花纹; 棋盘纹
block check: 29 phrases in 9 subjects
Aviation3
Chess1
Electronics6
Information technology8
Metallurgy1
Multimedia1
Shipbuilding1
Technology5
Telecommunications3