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3) Polyvinyl Chloride

4) Acrylic polymer
5) Silicon carbide

Which includes natural polymers that can be used to make thin
films/cellophane paper are …

a. 1), 2), and 3)
b. 1)

c. 2)

d. 3) and 4)
e. 2) and 3)

19. The progress of nanotechnology is very rapid, along with the progress

of the times. One example of the application of nanotechnology in the
fabric industry is a fabric that can hold water. The material used to coat

the fabric so that it can prevent water from wetting the fabric is a

filament. . .
a. Nanocarbon

b. Nanocellulose
c. Nanosilicone

d. Nanotoluena
e. Nanotechonogly

20. Pay attention to the following picture.

Source: https://upload.wikimedia.org/wikipedia/com
mons/4/41/C60a.png