A. 接地刀闸 B. 阻尼电阻器投切控制器 C. 阻尼电阻电抗器 D. 阻尼电阻电阻器
A. 正确 B. 错误
A. urgency or an emergency B. the vessel's national identity signal C. a group from the general signal code D. a group from the medical signal code