When should breathing protection be used with heat exchangers?
a. During normal operations
b. During abnormal events
c. When toxic gases may be present
d. At all times
a. Incorrect. Breathing protection should be used if toxic gases may be present.
b. Incorrect. Breathing protection should be used if toxic gases may be present.
c. Correct. Breathing protection should be used if toxic gases may be present.
d. Incorrect. Breathing protection should be used if toxic gases may be present.
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Fill in the blank(s) with the appropriate word(s).