In this article, the cause of the fracture of the piston rod used in 4M50 hydrogen compressor in the hydrocracking device was analyzed.
对镇海炼油化工股份有限公司加氢裂化装置4M50型新氢压缩机活塞杆两次断裂的原因进行综合分析,并提出了补救和预防措施。
RESULTS: There were 45 patients involved in this study, including 23 patients in betamethasone neomycin ointment group and 22 patients in hydrocortisone neomycin ointment group.
方法 :选择限局性亚急性湿疹患者进行随机双盲、平行组对照临床试验研究 ,选择新氢松软膏进行对照。
