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循环接头 xúnhuán jiētóu
dril. cir. sub
oil circulating sub; circulating nipple
冷却水循环接头 xúnhuán jiētóu
chem. circulating connection
循环异径接头
dril. circ swedge
循环接头: 5 phrases in 3 subjects
Drilling1
Oil / petroleum3
Technology1