题目内容

固体物质随着晶粒尺寸的细化，其熔点将表现出明显变化。差热分析(DTA)实验表明，平均粒径为40nm 的纳米铜粒子的熔点与同一种固体材料的熔点相比，

A. 降低 300℃左右
B. 无明显变化
C. 升高 300℃左右
D. 由3000℃左右降到 1000℃

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