... mains hum 电源交流哼声... mains unit 供电整流器 mains filter 电源滤波器 ...
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ring mains unit 环网配电柜
universal mains unit 通用整流电源
mains-powered unit 供电单元
·2,447,543篇论文数据，部分数据来源于NoteExpress
The corrosive nature of the ground soil and pressures from a nearby brick wall and telecom unit may have caused a fracture in the cast iron mains pipe, the HSE said in its report.
BBC: Police awards for Shrewsbury gas explosion rescue
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