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replacing bit without lifting drills
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replacing bit without lifting drills
Encyclopedia
理学
钻进工艺
释
replacing bit without lifting drills
不提钻换钻头
绳索取心钻进过程中,在不起下钻的情况下,将孔底旧钻头单独或随内管总成一起打捞至地面,并将新钻头单独或随内管总成一起下入孔底进行钻进的作业。
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Weed diversity
weed dormancy
weed ecology
weed fecundity
weed flora
weed growth potential
weed harmfulness
weed induced dormancy
weediness
weeding hoe
weeding in ancient China
weed innate dormancy
weed mimicry
weed persistence
weed phenology
weed plasticity
weed population dynamics
weed population ecology
weed quarantine
weed quarantine methods
weed rate of turf
Weed Research
weed resistance to pesticide
Weed Science
weed science
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