Angular material 从“动态材质选择”中禁用选定选项

我想禁用动态加载选项数组中的选定选项

HTML

   <div>
                                <mat-select
                                  placeholder="Select a file type"
                                  formControlName="title"
                                  #title
                                  (selectionChange)="onChangeTitle($event.value)"
                                >
                                  <mat-option
                                    *ngFor="
                                      let title of myTitles | keyvalue
                                    "
                                    [value]="title.value"
                                    [disabled]=""
                                  >
                                    {{ title.key }}
                                  </mat-option>
                                </mat-select>
                              </div>

  myArr = [
    'X',
    'X2',
    'X3',
  ];