“兆欧”用英语怎么说

电泵在使用前, 应用兆欧表检查电机绝缘电阻.Pump before use, application table to check the electrical insulation resistance.然后摇测电机的绝缘电阻,其值不低与50兆欧.And shake the electrical insulation resistance measurement and its value is not lower than 50 m...