metallic return operation 单极金属回线方式
Specification of return operation 退货作业规范
monopolar ground return operation 单极大地回线
Latest operation return code 作业状态
return rate of operation 运营收益率
non-return-to-zero operation 不归零操作
return to full power operation 重返满功率运行
buying operation under return agreement 附加退回条件的购买
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