[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fNIqAGXynab0CvIO94LpkwgkVGsWH3XV6FPA67_zFCl0":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":11,"question":18,"related":19,"source":27,"type":47},[],"2024-03-26 16:57:18",135705228,[8,9,10],"Te-TL=0","dTe\u002Fdt-dTL\u002Fdt<0","不确定",{"count":12,"courseId":13,"courseImg":14,"courseName":15,"workId":16,"workName":17},51,"a51aeca87d61a61efa85bfc3319f5092","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff25d98862b76398c79bbc969e243c8ca.png","电机及拖动基础-2024","work_33266224","3.运算符和表达式","对于一个电力拖动系统,稳定运行的充分必要条件是",[20,29,34,39,44,48,59,69,78,87],{"answer":21,"createTime":5,"id":22,"options":23,"question":26,"source":27,"type":28},[],135705224,[24,25],"正确","错误","电力拖动系统是由电动机与负载两部分组成的,通常把电动机的电磁转矩与转速之间的关系称为机械特性,不同的电动机具有不同性质的机械特性,可以用数学形式表示成n = f (Te)","v1",3,{"answer":30,"createTime":5,"id":31,"options":32,"question":33,"source":27,"type":28},[],135705225,[24,25],"所谓电力拖动系统稳定运行是指系统在扰动作用下,离开原来的平衡状态,但仍然能够在新的运行条件达到平衡状态,或者在扰动消失之后,能够回到原有的平衡状态",{"answer":35,"createTime":5,"id":36,"options":37,"question":38,"source":27,"type":28},[],135705226,[24,25],"对于恒转矩负载,如果电动机的机械特性呈下垂曲线,系统是稳定的;反之,则不稳定.进一步分析可知,对于非恒转矩负载,如果电动机机械特性的硬度小于负载特性的硬度,该系统就能稳定运行",{"answer":40,"createTime":5,"id":41,"options":42,"question":43,"source":27,"type":28},[],135705227,[24,25],"电力拖动系统在电动机机械特性与负载转矩特性的交点上,并不一定都能够稳定运行,也就是说,Te = TL仅仅是系统稳定运行的一个必要条件,而不是充分条件",{"answer":45,"createTime":5,"id":6,"options":46,"question":18,"source":27,"type":47},[],[8,9,10],1,{"answer":49,"createTime":50,"id":51,"options":52,"question":57,"source":27,"type":58},[],"2024-04-21 09:19:29",138295960,[53,54,55,56],"x*=x+1","x*=(1+x)","x++,2*x","2*x,x+=2","设有定义:int x=2;,以下表达式中,值不为6的是________",0,{"answer":60,"createTime":61,"id":62,"options":63,"question":68,"source":27,"type":58},[],"2024-04-14 16:34:26",138295961,[64,65,66,67],"1","0","true","非零值","表达式:10!=9的值是___",{"answer":70,"createTime":61,"id":71,"options":72,"question":77,"source":27,"type":58},[],138295962,[73,74,75,76],"4","12","3","11","设有 int x=11; 则表达式 (x++ * 1\u002F3) 的值是",{"answer":79,"createTime":61,"id":80,"options":81,"question":86,"source":27,"type":58},[],138295963,[82,83,84,85],"交换x和y中的值","把x和y按从大到小排列","把x和y按从小到大排列","无确定结果","设x和y均为int型变量,则以下语句:x+=y;y=x-y;x-=y;的功能是______",{"answer":88,"createTime":89,"id":90,"options":91,"question":94,"source":27,"type":58},[],"2024-04-14 16:34:29",138295964,[92,53,93,54],"x++,3*x","2*x,x+=6","设有定义:int x=3;,以下表达式中,值不为12的是( )"]