How many processes are there during the security check?
举一反三
- How to check the quality during production（） A: Check every one. B: Take samples to check it. C: Check it at random.
- How many pieces of luggage do you want to check?
- How many themes will the students be required to write during the semester
- How many other short Hobbits accompanied Frodo during the journey? ____
- security check