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Pick out the wrong statement. | |
A. | Refractories used in muffle furnace should have low thermal conductivity. [Correct Answer] |
B. | The electrical resistivity of refractories drops rapidly with rise in temperature. [Wrong Answer] |
C. | For reducing spalling tendency, the refractory should be well fired and its porosity should be more. [Wrong Answer] |
D. | Refractoriness under load (RUL) of a refractory is always less than its refractoriness. [Wrong Answer] |