在大量试验基础上，对预制板混凝土配合比进行研究。
Based on many tests, we studied mixture ratio of watercourse precast concrete board.
叠合板式剪力墙中，预制板与核心混凝土部分能够较好地共同工作。
Meanwhile, in the superposition beat shearing force wall, the precast block and the core concrete part can work cooperatively.
一位名叫杨玉蓉的中年母亲抬起100公斤重的预制板，救出了自己的儿子。
Yang Yurong, a middle-aged mother, saved her son by lifting a 100kg concrete slab.
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