Joke Collection Website - News headlines - Which part should be the obvious position marked by the tower crane number?

Which part should be the obvious position marked by the tower crane number?

There are two numbers, one is the factory number display position 1. The product nameplate is generally fixed in the cab or in the basic section 2, and the product certificate 3 is the technical supervision and inspection certificate.

The second is the title certificate number, just like the driving license number of a car.