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dual valve
auto. 双气门一气缸有两个进气门或排气门
oil 双联阀
refrig. 复式〔双联〕阀
tech.
wind. 复式阀
dual valve: 38 phrases in 9 subjects
Automobiles10
Aviation3
Chemistry1
Compressors1
Drilling2
Oil / petroleum9
Refrigeration1
Technology9
Telecommunications2