当球珠已在金属板上冷却，把它转移到一个研钵里，研磨成细粉。
When the bead has cooled on the metal sheet transfer it to a mortar and grind to a fine powder.
当球珠已在金属板上冷却，把它转移到一个研钵里，研磨成细粉。
When the bead has cooled on the metal sheel transfer it to a mortar and grind to a fine powder .
利用超声电解法能够制备出超细金属粉。
Ultrafine metal powder can be prepared successfully by means of...
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