發送短信 : Formation of nanocrystalline tungsten by selective laser melting of tungsten powder

 _____     __   __    ____     __   __            
|  __ \\   \ \\/ //  |  _ \\   \ \\/ //     ___   
| |  \ ||   \ ` //   | |_| ||   \ ` //     /   || 
| |__/ ||    | ||    | .  //     | ||     | [] || 
|_____//     |_||    |_|\_\\     |_||      \__ || 
 -----`      `-`'    `-` --`     `-`'       -|_|| 
                                             `-`