<nz-select*ngFor="let part of item.combin; let i = index"style="float: left; margin-right: 5px; width: 150px;"(ngModelChange)="handlePartChange($event,item,i)">
<nz-select*ngFor="let part of item.combin; let i = index"[attr.data-index]="i"[(ngModel)]="bgItem.questions[QI]._combin[i]"style="float: left; margin-right: 5px; width: 150px;"(ngModelChange)="handlePartChange($event,QI,i)">
<nz-option*ngFor="let hot of hotZoneArr; let j = index;"[nzValue]="j"[nzLabel]="(j+1)+'-'+hot.text"></nz-option>
<nz-option*ngFor="let hot of hotZoneArr; let j = index;"[attr.data-index]="j"[nzValue]="j"[nzLabel]="(j+1)+'-'+hot.text"></nz-option>
</nz-select>
<!-- <select *ngFor="let part of item.combin; let i = index" style="float: left; margin-right: 5px; width: 150px;" (change)="handlePartChange($event, QI, i)">