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to phrases
unit check
agric. 部件检査
avia. 单元测验; 装置检查
el. 部件检验; 单元检验; 设备校验
tech. 设备检验; 部件校验
unit check: 11 phrases in 7 subjects
Aviation2
Electronics2
Mathematics2
Mechanics1
Oil / petroleum1
Space1
Technology2