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十字形钻头
gen. crossbit
bridg.constr. cross bit
eng.geol. four-point bit; square bit
expl. X-bit; X-chisel
geol. four wing rotary bit
oil four point bit; star bit
tech. cross-chopping bit (破碎孔底岩柱用)
十字形钻头: 13 phrases in 4 subjects
Drilling2
Engineering geology2
Oil / petroleum3
Technology6

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