What are the two main ballroom styles?
举一反三
- What are the two most commonly used citation styles?
- What are the two main genres of writing?
- What are the two main islands of the British Isles?
- 中国大学MOOC: What are the two main functions of the foreign exchange market?
- 中国大学MOOC: What are the two main functions of transaction management in OLTP systems?