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stepped voltage
 stepped voltage
tech. 步进电压
| regulation
 regulation
environ. 管理
hydroel.st. 条例; 调节; 调整
hydrol. 急流河槽控制
met. 控制
patents. 法规

to phrases
stepped voltage
tech. 步进电压
stepped voltage regulation
: 2 phrases in 2 subjects
Electric machinery1
Rail transport1