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step-back method of welding：分段反向焊法

step by step seam welding步进式缝焊 | step-back method of welding分段反向焊法 | step-back welding逆向分段焊接; 后向分段焊接

step rate：步进梁

分步开挖:digging step by step | 步进梁:step rate | 阶梯制:step system

step-by-step procedure：逐步过程

逐步法 step-by-step method | 逐步过程 step-by-step procedure | 按步连续 stepwise continuous

step up substation：升压变电所

step tuning 阶梯式调谐 | step up substation 升压变电所 | step up transformer 升压变压器

step-up transformer：升压器

step-up 升高,加快 | step-up transformer 升压器 | step-wedge 楔形梯级

step-up ratio：升压比率

step-index monomode fiber 阶跃折射率单模光纤 | step-up ratio 升压比率 | step-up transformer 升压变压器

out of step：步调不一致,不协调

step up 提高,加快,加紧 | out of step 步调不一致,不协调 | step in 插入,介入

Step wedge：楔形梯级

step-up transformer 升压器 | step-wedge 楔形梯级 | step-wedge penetrameter 楔形梯级式X射线透度计

Step-up Cascade Composite Index Method：递阶层次综合指数法

自适应分步傅立叶方法:adaptive split-step Fourier method | 递阶层次综合指数法:Step-up Cascade Composite Index Method | 分步傅立叶方法:split-step fourier method

step type drag bit：阶梯形刮刀钻头

step type bit 阶梯形钻头 | step type drag bit 阶梯形刮刀钻头 | step up 升压

phenol red：酚红,苯酚磺酞

phenol reagent 酚试剂 | phenol red 酚红,苯酚磺酞 | phenol red test 酚红排泌试验

accessory equipment：附件

accessory equipment 辅助设备 | accessory equipment 附件 | accessory part 附件