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to phrases
subtractive process
oil
杂质
过程
PCB
除去杂物〔除去某种物质〕 过程
;
精制〔减法〕过程
;
减色法
tech.
精制过程
;
脱除
杂质
过程
subtractive process:
3 phrases
in 2 subjects
Oil / petroleum
2
Technology
1
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