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打头 dǎtóu
avia. driven head
eng.geol. drive head
met. cressing (拔管前进行的)
oil drivehead
tech. bumper sub (撞击被卡钻具用); cathead anvil; doll head; jar collar
拳击…的
gen. nob
装在钻杆上以承受锤击的打头 dǎtóu
gen. drivehead
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