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Before carrying out the characterization, one vital procedure is（）

Before carrying out the characterization, one vital procedure is（）
A.forming
B.sampling
C.casting
D.forging
正确答案：sampling

标签：材料概论

上一条：（）is a method of thermal analysis which measures the difference in heat flow rate between a sample and inert reference as a function of time and temperature.

下一条：（）is a quantitative spectroscopic technique that measures the elemental composition, empirical formula, chemical state　and electronic state of the elements that exist within a material.