ผู้เขียน: Hugh Klein

Looking back over the course of the three-plus decades of the HIV/AIDS epidemic, scholars and researchers have made many significant strides in understanding and responding to HIV and AIDS. From the …

Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done by melting the workpieces and adding a filler materia …