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to phrases
closed path
el. 关闭的路径
el.mach. 闭合磁路
hydroel.st. 闭路; 闭合回路; 通路
math. 闭合回〔通,道〕 路
tech. 闭合电流
closed path: 5 phrases in 3 subjects
Automatic control1
Electronics2
Oil / petroleum2