Usually a business call should not be longer than ______ minutes.
举一反三
- A business call should not be longer than 1 minute.
- A business call should be made _________________.
- The business lunch in south America is longer than that in America.
- . The lifespan of master key is usually longer than that of session key. ( )
- The lifespan of session key is usually longer than that of master key. ( )