1.

ASTM Grain size measurement method counts the __________________

A. number of grain in 1 mm<sup>2</sup> at magnification of 1X
B. number of grain in 1 mm<sup>2</sup> at magnification of 100X
C. number of grain in 100 mm<sup>2</sup> at magnification of 1X
D. number of grain in 100 mm<sup>2</sup> at a magnification of 100X
Answer» B. number of grain in 1 mm<sup>2</sup> at magnification of 100X


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