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        ²úÆ·ÌØÕ÷£ºThe diameters measured were between 1 and
42  mm.  This  diameter  range  was  divided  into  different subranges and the particle size distribution was determined: aluminum  oxide  particles  [diameter  range:  percentage]:1¨C4 ΢Ã×: 96%; 5¨C10 ΢Ã×: 3.2%; 11¨C15 ΢Ã×: 0.7%; 16¨C20 ΢Ã×: 0.1%   (3,627   particles   were   measured);

        ÊÔ¼Á¶þ£º »¬Ê¯·Û   Talc powder (hydrous magnesium silicate 3MgO 4SiO2 H2O, Sigma-    Aldrich (Seelze, Germany) 243604)
      
        ²úÆ·ÌØÕ÷£º  talc   powder[diameter range: percentage]: 1¨C4 ΢Ã×: 73.7%; 5¨C10 ΢Ã×:
16.1%; 11¨C15 ΢Ã×: 6.7%; 16¨C20 ΢Ã×: 2.1%; 21¨C25 ΢Ã×: 0.7%;
26¨C31 ΢Ã×: 0.3%; 32¨C36 ΢Ã×: 0.3%; 37¨C42 ΢Ã×: 0.1% (1,765
particles were measured).

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