选取公司设计的五千米快装钻机中的某连接部件处的PJP坡口焊缝作为研究对象,分别从焊缝形状的设计计算、减小焊接变形的焊接工艺、......

Co-trimoxazole is a combination antibiotic made up of trimethoprim and sulphamethoxazole that is first line treatment fo......