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前级泵
qiánjíbèng
met.
rough pump
oil
forepump
;
backing pump
space
booster pump
tech.
prepump
前级〔预抽〕泵
gen.
prepump
前级〔前置〕泵
gen.
forepump
前 级泵
:
7 phrases
in 3 subjects
Construction
1
Space
3
Technology
3
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