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				| 1. | Calculate the fracture stress of brittle material with the following properties.E=200GPa, Surface energy=1.2 Jm-2, c=0.5*103nm | 
| A. | 346.4 MPa | 
| B. | 648.9 MPa | 
| C. | 589.9 MPa | 
| D. | 5898.8 MPa | 
| Answer» B. 648.9 MPa | |