Physical therapy assistants must work under the supervision of a physical therapist

The critical temperature for steel trusses is:

A. 300°F (149°C). B. 500°F (260°C). C. 900°F (482°C). D. 1,000°F (538°C).

_________ is used to restore both developer and fixer chemicals to their original strength

Fill in the blank(s) with correct word