[问答题] 发电机在运行中失磁的原因有哪些？

幼儿园中负责指导调配幼儿膳食，检查食品、饮水和环境卫生的是（） ["保育员","医务人员","炊事员","事物人员"] 对依法不追究刑事责任的，如果已经追究，应当根据不同情况分别决定（） ["撤销案件","中止审理","不起诉","宣告无罪"] The STUDENT_GRADES table has these columns: The registrar has asked for a report on the average grade point average (GPA) for students enrolled during semesters that end in the year 2000. Which statement accomplish this?（） ["","","","","",""] 浇注式沥青混合料的摊铺使用浇注式专用摊铺机。该摊铺机主要由三部分组成：自行牵引系统、（）以及前置的布料系统。 ["振动压实系统","自动化系统","加热系统","混合料摊铺系统"] 脓性指头炎出现搏动性跳痛时首先应采取的措施是（） ["切开减压","理疗","应用抗生素","热盐水浸泡","外敷鱼石脂软膏"] 发电机在运行中失磁的原因有哪些？