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ASTM International specifies the use of the letter ___ to designate smooth wire and the letter ___ to designate deformed wire. Fill in the blanks with the appropriate letters.

Answer :

Final answer:

ASTM International uses the letter 'W' to designate smooth wire and the letter 'D' to designate deformed wire. Smooth wire refers to non-textured wire whereas deformed wire has a patterned surface for better adhesion in certain applications.

Explanation:

According to ASTM International, which sets global construction standards, the letter 'W' is used to designate smooth wire, while the letter 'D' is used to designate deformed wire. Smooth-wire (W) references a wire with a non-textured surface, often used in various binding applications. Conversely, a deformed wire (D) typically includes indentations or patterns which create a better adhesion for things like concrete in construction applications.

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