对于大型复杂半圆环盒形结构件的加工，因其涉及的焊缝数量多、焊接变形量大、焊接变形趋势复杂，所以加工问题一直没得到很好的解决。......

Rocks are increasingly used in extreme environments characterised by high loading rates and high confining pressures.Thu......

在炮孔保留岩体的一侧药包加装半圆形硬质塑料管材，对爆轰波起到限制、阻隔、吸收、反射和滞留的作用。试验表明：46．95％的能量被吸收，应......

The use of leading edge with different geometrical patterns will affect the development of boundary layer flow on a flat......