Every instance of an abstract type is an instance of some concrete subtype.
举一反三
- We will also visit some museums, _________________, the Forbidden City. （for instance）
- Which of the following is the order of applying object-oriented concept in programming A: instance creating — class defining — use attributes or methods through the instance B: class defining — instance creating — use attributes or methods through the instance C: instance creating — use attributes or methods through the instance — class defining D: class defining — use attributes or methods through the instance —instance creating
- 下面不是JavaScript的关键字的是。 A: abstract B: interface C: native D: instance
- For instance:
- In 1960, for instance, fifteen African countries became independent, __ have changed their names. A: some of which B: some of whom C: any of whom