4.The convector pits are covered with convrete grids that are prefabricated for building pigsties.
供热器并被通常用在猪圈上的混栅覆盖。
5.and, (3) for a cast unhardened concrete member, a prefabricated plate is stuck to the surface of the member concrete.
(3)对于已浇注、尚未硬化的混构件,将预的材贴附于构件混表面。
6.(3)对于已浇注、尚未硬化的混构件,将预的材贴附于构件混表面。
and, (3) for a cast unhardened concrete member, a prefabricated plate is stuck to the surface of the member concrete.
7.Model testing study is made on prefabricated spiral V-notch blasting, and hydromatic method is used to simulate the quasi-static process in blasting of explosive.