發送短信 : Machinability of metal matrix composites

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| \  / ||   / _ \\   / ____||   / _ \\   |  _ \\  
|  \/  ||  / //\ \\ / //---`'  / //\ \\  | |_| || 
| .  . || |  ___  ||\ \\___   |  ___  || | .  //  
|_|\/|_|| |_||  |_|| \_____|| |_||  |_|| |_|\_\\  
`-`  `-`  `-`   `-`   `----`  `-`   `-`  `-` --`