永磁电机主要存在哪些问题？
战勤保障大队方位灯储备数量为50只。
战勤保障大队消防员呼救器储备数量为50只。
As operator of a 199 GT towing vessel sailing foreign，it shall be your duty to enter in the Official Logbook or other permanent record（）. ["all information contained on the barge's Certificate of Inspection","the condition of all towing gear to be used","all navigational aids to be used","the barges load line and draft reading"]
战勤保障大队消防轻型安全绳储备数量为50根。
交流三相感应电机的特点是什么？
