【简答题】试利用腐蚀极化图说明 16Mn 钢制成的埋地管道穿孔后,如果采用 A3 钢修补,尽管这两种钢耐腐蚀性相同(在土壤中腐蚀速度相同),但新的 A3 钢补口总是比原 16Mn 钢管更快遭受腐蚀的原因。
【单选题】Which term refers to the total quantity and quality of goods and services that people living in an economic system can purchase?
B.
demand and supply schedule
【多选题】加密技术通过( )可将明文变为非法获取者难以识别的密文进行通信,从而实现信息在通信方之间的安全传递。
【单选题】Which term refers to the total quantity and quality of goods and services that people living in an economic system can purchase?
B.
demand and supply schedule
【判断题】The term capacity refers to the maximum quantity an operating unit can process over a given period of time.