Prefabricated Sheet United with Merged Sheet are used in Brick and Concrete Residence Building; The Application of the Post-tensioned Binder-free Prestressed Hollow Floor-plate 砖混住宅中预制板与叠合板的联合应用后张法无黏结预应力空心楼板的应用
Embryo encircled 3/ 4 of the yolk, dorsal to the embryo is a row of cuboidal cells, the spinal cord floor plate. This plate is ventral to the neural tube. The floor-plate extends anteriorly to the hindbrain. 胚体绕卵黄3/4时,位于脊索背部和神经管腹面的一排立方体细胞称为脊髓底板,并一直延伸到后脑的前端。