Pick out the wrong statement ?

A. For reducing spalling tendency, the refractory should be well fired and its porosity should be

B. Refractories used in muffle furnace should have low thermal conductivity

C. e

D. Refractoriness under load (RUL) of a refractory is always less than its refractoriness

E. The electrical resistivity of refractories drops rapidly with rise in temperature

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