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This speech has an impact in his later life.()

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零序电流互感器是电流型漏电保护装臵的检测元件。()

When Chopin was sixteen, he attended the Warsaw Conservatory of Music, directing by composer Joseph Elsner.()

当附加导线与接触网同杆合架时，保护线与支柱边沿的距离应不小于（）m

A. 0.4
B. 0.8
C. 1
D. 1.2

金属屏护装臵必须有良好的接零或接地。()