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DE 型氧化沟
water.res., ecol. class DE oxidation ditch
T 型氧化沟
water.res., ecol. class T oxidation ditch
A 型氧化沟
water.res., ecol. class A oxidation ditch
D 型氧化沟
water.res., ecol. class D oxidation ditch
VR 型氧化沟
water.res., ecol. class VR oxidation ditch
型 氧化沟: 6 phrases in 3 subjects
Ecology1
Electronics3
Technology2