manual electric arc welding造句

Manual electric arc welding
手工电弧焊
In 2002 , 24 new occupational safety and health publications were published , including five codes of practice that provide practical guidance respectively on safety management , control of air impurities from chemical substances , safe use of tower cranes , safe operation of electric steam boilers and safety on manual electric arc welding
在二零零二年，本处出版了24本新职安健刊物，包括五项工作守则，分别就安全管理、控制由化学品散发的空气杂质、安全使用塔式起重机、安全操作电热式蒸汽锅炉及手工电弧焊接安全，提供实务指引。
It's difficult to find manual electric arc welding in a sentence. 用manual electric arc welding造句挺难的