[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fqKzT_V4YUbW1ko_9agBRuBSYrheZqVgvXwIZLGnfFe4":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":10,"question":13,"related":14,"source":20,"type":21},[],"2025-12-20 08:44:54",1076142912,[8,9],"对","错",{"courseImg":11,"courseName":12},"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F44701264d86d923c1c7846fbe3e613f7.jpg","驱动电机及控制技术","燃料电池是个储存电能的装置.( )",[15,22,25,35,45,54,59,64,69,74],{"answer":16,"createTime":5,"id":17,"options":18,"question":19,"source":20,"type":21},[],1076142910,[8,9],"从电对人体影响来看,直流比交流更危险.( )","v2",3,{"answer":23,"createTime":5,"id":6,"options":24,"question":13,"source":20,"type":21},[],[8,9],{"answer":26,"createTime":5,"id":27,"options":28,"question":33,"source":20,"type":34},[],1076142914,[29,30,31,32],"电机内已产生旋转磁场","定转子都存在感应电动势","起动电流可达额定电流的6-7倍","起动转矩可达额定转矩的6-7倍","异步电机若直接起动,则在定子已加电源、转子尚未转时:( )",1,{"answer":36,"createTime":5,"id":37,"options":38,"question":44,"source":20,"type":34},[],1076142917,[39,40,41,42,43],"转子旋转磁场与定子旋转磁场同步","转子旋转磁场与定子旋转磁场不同步","转子与定子旋转磁场同步","转子与定子旋转磁场不同步","转子感应电流频率不等于定子绕组电流频率","对于异步电动机,下列说法正确的是( )",{"answer":46,"createTime":5,"id":47,"options":48,"question":53,"source":20,"type":34},[],1076142926,[49,50,51,52],"转子绕组","定子绕组","铁心","气隙","三相异步电机中在磁场作用下产生感应电动势的是( )",{"answer":55,"createTime":5,"id":56,"options":57,"question":58,"source":20,"type":21},[],1076142934,[8,9],"纯电动汽车与传统燃油汽车最大的区别是取消发动机、油箱,而以"三电"代替.( )",{"answer":60,"createTime":5,"id":61,"options":62,"question":63,"source":20,"type":21},[],1076142945,[8,9],"在纯电动汽车中,电动空调通常使用高压电源供电.( )",{"answer":65,"createTime":5,"id":66,"options":67,"question":68,"source":20,"type":21},[],1076142946,[8,9],"PWM技术通过改变脉冲信号的占空比来改变平均电压,常用于直流电机的调速.( )",{"answer":70,"createTime":5,"id":71,"options":72,"question":73,"source":20,"type":21},[],1076142949,[8,9],"异步电机运行时,功率因数cosφ某些时刻等于1.( )",{"answer":75,"createTime":5,"id":76,"options":77,"question":78,"source":20,"type":21},[],1076142954,[8,9],"无刷电机半控就是某时刻只有一相线圈通电,而且电流只能有一个方向;全控就是某时刻会有两相或三相线圈同时通电,而且电流方向总在变化.( )"]