Angular ng-zorro-antd 表单 nz-select 打乱布局

Question

• 我的 Angular 项目中使用了 ng-zorro-antd 的UI组件
• 制作表单时出现个情况，使用 input 布局没问题的，其中一个更换为 nz-select 布局就乱了

• 全部使用 input 的代码如下：（看“客户”要素）

     <nz-form-item >
   <nz-form-label [nzSpan]="7">单据日期</nz-form-label>
   <nz-form-control [nzSpan]="17" nzErrorTip="必填项">
     <nz-date-picker formControlName="billdate" placeholder="单据日期"
       (ngModelChange)="onChangeBilldate($event)"></nz-date-picker>
   </nz-form-control>
   </nz-form-item>
  
   <nz-form-item >
   <nz-form-label [nzSpan]="7">交期</nz-form-label>
   <nz-form-control [nzSpan]="17" nzErrorTip="必填项">
     <nz-date-picker formControlName="deliverytime" placeholder="交期"
       (ngModelChange)="onChangeDeliverytime($event)"></nz-date-picker>
   </nz-form-control>
   </nz-form-item>
  
   <nz-form-item >
   <nz-form-label [nzSpan]="7">客户</nz-form-label>
   <nz-form-control [nzSpan]="17">
     <input nz-input formControlName="clientid" placeholder="客户" />
  
     <!-- <nz-select formControlName="clientid" placeholder="客户">
       <nz-option nzValue="Option 1" nzLabel="Option 1"></nz-option>
       <nz-option nzValue="Option 2" nzLabel="Option 2"></nz-option>
     </nz-select> -->
  
   </nz-form-control>
   </nz-form-item>

• 效果如下：
• 

• 将“客户”要素更换为 nz-select 布局就乱了，代码如下：（看“客户”要素）

    <nz-form-item >
   <nz-form-label [nzSpan]="7">单据日期</nz-form-label>
   <nz-form-control [nzSpan]="17" nzErrorTip="必填项">
     <nz-date-picker formControlName="billdate" placeholder="单据日期"
       (ngModelChange)="onChangeBilldate($event)"></nz-date-picker>
   </nz-form-control>
   </nz-form-item>
  
   <nz-form-item >
   <nz-form-label [nzSpan]="7">交期</nz-form-label>
   <nz-form-control [nzSpan]="17" nzErrorTip="必填项">
     <nz-date-picker formControlName="deliverytime" placeholder="交期"
       (ngModelChange)="onChangeDeliverytime($event)"></nz-date-picker>
   </nz-form-control>
   </nz-form-item>
  
   <nz-form-item >
   <nz-form-label [nzSpan]="7">客户</nz-form-label>
   <nz-form-control [nzSpan]="17">
     <!-- <input nz-input formControlName="clientid" placeholder="客户" /> -->
  
     <nz-select formControlName="clientid" placeholder="客户">
       <nz-option nzValue="Option 1" nzLabel="Option 1"></nz-option>
       <nz-option nzValue="Option 2" nzLabel="Option 2"></nz-option>
     </nz-select>
  
   </nz-form-control>
   </nz-form-item>

• 使用 nz-select 的效果如下：
• 
• 有必要的话：QQ = 409223171