A standard respirator with a HEPA filter can be used for very short exposure to fumes from welding _____.
a. zinc or copper
b. stainless steel
c. high-carbon steel
d. titanium
Answer: A
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If staples are not required to close the lap joint on duct wrap, then _____.
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____________________ bones, like ribs, protect vital organs.
Fill in the blank(s) with the appropriate word(s).