polarity

• Double - polarity method for calibrating thermocouple
  热电偶双级检定法
• Same - polarity method of calibrating thermocouple
  热遇偶同名极检定法
• Analogue audio recording on video tape - polarity of magnetization
  录像带声模拟录制.磁化极性
• Reverse polarity and limit protection lightning strike protection
  具有反向极性保护及限流保护
• Reverse polarity and limit protection
  具有反向极性保护及限流保护
• Scalar accounts for polarity items abroad
  国外极性词语的梯级研究
• Overload and reverse polarity protection
  过载与极性反向保护功能
• Analogue audio recording on video tape ; polarity of magnetization
  录像带上模拟声音录制.磁化极性
• Analogue audio recording on video tape . polarity of magnetization
  录像带的模拟音频录音.磁化的极性
• Isolation and reverse polarity protection
  绝缘强度及反向保护