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双闸板防喷器
shuāng zhábǎn fángpēnqì
dril.
double blowout preventer
;
double preventer
;
double ram
type
preventer
;
preventer of double ram type
;
double ram preventer
双闸板防喷器
:
4 phrases
in 2 subjects
Oil / petroleum
1
Technology
3
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