它不仅达到所需的耐火极限，而且还具备相当高的机械强度，与楼层水泥板的硬度相差无几。
It not only achieve the required fire resistance, but also has very high mechanical strength, and hardness of cement board floor is almost the same.
它不仅达到所需的耐火极限，而且还具备相当高的机械强度，与楼层水泥板的硬度相差无几。
It not only achieve the required fire resistance, but also has very high mechanical strength, and hardness of cement board floor is almost the same.
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