Investment casting-এ ব্যবহৃত হয় কোন Pattern?

Investment casting-এ ব্যবহৃত হয় কোন Pattern?

  1. a) Wax Pattern
  2. b) Wooden Pattern
  3. c) Polystyrene Pattern
  4. d) Lead Pattern

From the BPSC Senior Instructor 2021 – Preliminary exam, question 38 of 93.

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