| 1. | Nullable type can contain three different values
可空类型可以包含三个不同的值： |
| 2. | The most important members of a nullable type are its
可空类型的最重要成员是它的 |
| 3. | For a schema with a nullable attribute and
中带有可为空值的属性的schema ，以及 |
| 4. | This sample demonstrates how to use nullable types
本示例演示可空类型的使用情况。 |
| 5. | The default value for a nullable type variable sets
可空类型变量的默认值将 |
| 6. | Nullable types are a special case of generic types
下表显示用于各种类型的 |
| 7. | For more information on nullable types , see
有关可空类型的更多信息，请参见 |
| 8. | Nullable types have the following characteristics
可空类型具有以下特性： |
| 9. | True . for more information about nullable types , see
（有关可空类型的更多信息，请参见 |
| 10. | Is nullable , whereas a value type such as
的引用类型就是可空类型，而类似 |
