The image below is a schematic flow diagram of a typical oil refinery that depicts the various unit processes and the flow of intermediate product streams that occurs between the inlet crude oil feedstock and the final end products.
In order to check-in into a hotel, the person must be 21 years old.  If the person is younger than 21, then a parent or guardian can  give permission for them to check-in. 1 person found this useful.
EMERGENCY ANSWER: Waiters in tourist spots do, at the hotel desk they do, people under 25 do, police officers don't, grandmothers don't. Some travelers feel the need to learn a few words before they go on vacation. They want to be able to say hello, please and thank you in the local language.