// 方法1:用Row + Col 定义自己需要的宽度,把layout属性设置为'horizontal',
 const formLayout = {
      labelCol: { span: 4 },
      wrapperCol: { span: 14 },
     }
 ---------------------------------------------------------    
 <Form layout="horizontal" {...formLayout }>
  <Row>
  <Col span={6}>
   <Form.Item label="xxx">
   <Select>
    ....
   </Select>
   </Form.Item>
  </Col>
  <Col span={6}>
   <Form.Item label="xxx">
    <Select>
    ....
    </Select>
   </Form.Item>
  </Col>
      </Row>
 </Form>
 
 //方法2 给 Form.Item 手动设置宽度
 <Form layout="inline" {...formLayout }>
   <Form.Item label="xxx" style={{width:'25%'}}> //百分比
   <Select>
    ....
   </Select>
   </Form.Item>
   <Form.Item label="xxx" style={{width:'200px'}}>// 固定宽度
    <Select>
    ....
    </Select>
   </Form.Item>
 </Form>