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Retained samples are kept by a cement works so that

  • A.the laboratory always has material available for staff training
  • B.the standard requires a fixed quantity of stock to be held back
  • C.a later dispute can be investigated on the material supplied
  • D.the cement can be resold elsewhere if a customer refuses it

Answer: C

If a structure gives trouble, the retained sample allows the cement actually delivered to be tested again. Without it the argument would rest on records alone with nothing to examine. Retained samples are usually kept for several months at least.

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