A. 燃油中有水 B. 燃料管路堵塞 C. 电磁阀故障 D. 引风机启动
A. 电压及对称性 B. 频率 C. 波形 D. 发电机阻抗 E. 电动机Y-△运行
A. should be coiled in a clockwise direction B. should be coiled in a counterclockwise direction C. may be coiled either clockwise or counterclockwise D. should never be coiled