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Q. |
On Moh's scale, materials with hardness number less than 4 are |
A. | Topaz, Corundum, Diamond |
B. | Hardened and tempered |
C. | Felspar, corundum, Diamond |
D. | Fluorite, Felsper, Talc |
E. | Talc, gypsum, calcite |
Answer» E. Talc, gypsum, calcite |
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