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jiayou201101: ½ð±Ò+8, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2016-01-15 09:20:19
In the test, 4kg of load is applied on for 1s, the vickers hardness of crystal is 25kg/mm2.
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