• 1. steady direct current: 恒稳直流电 | 恒稳直流
• 2. steady y direct current: 恒稳直流电
• 3. direct current steady voltage: 直流稳压

• 1.The paper presents the status of and the operation method take by the accumulator as well as the direct current system one by one to ensure the reliable and steady-going operation of the whole system.
  结合该工程，介绍了海底世界工程特点、对室内空气温湿度的要求、暖通空调和防排烟系统设计以及直流式空调系统中热管换热器的应用。
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