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全封闸板 quán fēng zhábǎn
dril. hole-closure rams
防喷器全封闸板 quán fēng zhábǎn
dril. blind ram; blank ram
同 blind ram,master ram 防喷器全封闸板 quán fēng zhábǎn
dril. blank ram
全封闸板
: 12 phrases in 4 subjects
Drilling3
Mechanics1
Oil / petroleum7
Technology1

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