This is especially important on a concrete roof, since concrete is a live material which can dilatate with high temperature and create movements on the roof.
在混凝土屋顶上尤其突出，因为混凝土是一种活性建筑材料，高温时会产生膨胀并导致移动。
To observe and analyze the phase transformations characteristics of 35 steel during cooling after continuous heating with dilatate method and metallography microscope.
运用膨胀法及金相显微镜观察分析35钢连续加热后冷却过程中相变特点。
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