<nz-select*ngFor="let part of item.combin; let i = index"[attr.data-index]="i"[(ngModel)]="questionsLeft[QI]._combin[i]"style="float: left; margin-right: 5px; width: 100px;"(ngModelChange)="handlePartChange($event,1,QI,i)">
<nz-select*ngFor="let part of item.combin; let i = index"[attr.data-index]="i"[(ngModel)]="questionsMiddle[QI]._combin[i]"style="float: left; margin-right: 5px; width: 100px;"(ngModelChange)="handlePartChange($event,2,QI,i)">
<nz-select*ngFor="let part of item.combin; let i = index"[attr.data-index]="i"[(ngModel)]="questionsRight[QI]._combin[i]"style="float: left; margin-right: 5px; width: 100px;"(ngModelChange)="handlePartChange($event,3,QI,i)">