Mașină de hârtie servo
Cum rețin paharele de hârtie apa?
O pahar de hârtie is a disposable ceaşcă made out of hârtie and often lined or coated with plastic or wax to prevent liquid from leaking out or soaking through the hârtie. It may be made of recycled hârtie and is widely used around the world.
