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Oil / petroleum
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5W
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5-day biochemical oxygen demand
5天生化需氧量
Pipeline Contractors5 Association
美国
管道工程承包商协会
repeated 5-spot
重五点法布井
strain gauge panel 5 ones digit
【测】应变压力计面板万位数字
type ZSM-5 molecular sieve
ZSM-5 型分子筛
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