1.

The empirical relationship for neck growth rate due to grain boundary transport from sources on the grain boundary is R4= _______

A. 4D<sub>B</sub> <sub>B</sub> (FK_{2}^1 )/x
B. 4D<sub>B</sub> <sub>B</sub> (FK_{2}^1 )/x<sup>2</sup>
C. 4D<sub>B</sub> <sub>B</sub> (FK_{2}^1 )/a
D. 4D<sub>B</sub> <sub>B</sub> (FK_{2}^2 )/x
Answer» E.


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