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drop weight
avia.	下落重量; 落锤重量
dril.	下击锤
eng.geol.	落球锤
met.	落锤; 碎铁锤; 落〔吊，打桩〕 锤
oil	打桩锤

drop weight: 36 phrases in 15 subjects

Automobiles	1
Chemistry	1
Earth sciences	1
Engineering geology	2
Explosives and Explosive Ordnance Disposal	3
Lighting other than cinema	1
Metallurgy	4
Oil / petroleum	3
Oil processing plants	1
Plastics	2
Polymers	6
Rail transport	1
Space	1
Technology	8
Weightlifting	1