contain
举一反三
- Currency options sold through an options exchange: A: contain a commitment to the owner, and are standardized. B: contain a commitment to the owner, and can be tailored to the desire of the owner. C: contain a right but not a commitment to the owner, and can be tailored to the desire of the owner. D: contain a right but not a commitment to the owner, and are standardized.
- Fat-soluble vitamins contain（ ）
- All syllables contain a _____.
- A cover letter should contain ...
- The functions of the welding slag contain:_____________、_____________and _____________。