Which material constitute the test tube rack?

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Solution

A test tube rack is a piece of laboratory equipment that holds a large number of test tubes upright at once.
Plastic, metal wires, wood, and other materials are used to make test tube racks.

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Which material constitute the test tube rack?

A test tube rack is a piece of laboratory equipment that holds a large number of test tubes upright at once.Plastic, metal wires, wood, and other materials are used to make test tube racks.

A test tube rack is a piece of laboratory equipment that holds a large number of test tubes upright at once.
Plastic, metal wires, wood, and other materials are used to make test tube racks.