A.10 B.12 C.8 D.11
A.型式試驗(yàn) B.并網(wǎng)檢測(cè) C.檢修維護(hù) D.設(shè)備升級(jí)
A.46.5Hz~49.5Hz B.47Hz~49.5Hz C.47.5Hz~49.5Hz D.48Hz~49.5Hz