Answer: D. two inclined planes back to back.
Step-by-step explanation:
A screw is a type of fastener, typically made of metal and used to hold objects together by turning it, which causes it to thread into the material it is being screwed into. The inclined planes, also called threads, are wrapped around a cylindrical rod, called a shank. As the screw is turned, the threads engage with the material and the screw moves forward, pulling the two pieces of material together and creating a clamping force.
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