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A sample for testing must be representative, which normally means it is

  • A.a composite of several increments taken over time
  • B.a single scoop taken from the top of a storage silo
  • C.the first cement produced immediately after a mill start
  • D.taken only from those bags rejected by a customer

Answer: A

Compositing evens out short-term variation so the result describes the material actually supplied. A grab sample would describe only whatever happened to be at that spot at that moment. Compositing is written into every sampling standard for this reason.

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