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【单选题】
如何在过冷现象发生后准确确定样品的凝固点是二元合金相图绘制实验的难点之一。以下叙述错误的是（ ）。A.
对于纯物质，过冷后的水平段对应的温度就是该纯物质的凝固点。
B.
对于二组分混合物系，将过冷后的曲线反向延长使其与过冷前的曲线相交，交点温度即为凝固点。
C.
对于纯物质，过冷后的水平段反向延长线与过冷前的曲线相交，交点温度即为凝固点
D.
对于二组分混合物系，过冷后温度回复后的拐点对应的温度即为凝固点。
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