Ø GB16899-1997自动扶梯和自动人行道的制造与安装安全规范留学美国中介Ø EN115-2008 Safety of escalators and moving walks-Part 1: Construction and installation EN115-2008和国家标准GB16899-1997是我们扶梯产品设计的主要标准依据,内容基本等同。标准的目的是保证在运行,维修和检查工作期
高考题型拆分组合练(二) 知识运用精准练effyⅠ.完形填空Alonzo Johnson stopped.He decided to help a(n) 1 elderly man down an escalator (自动扶梯) in a Massachutts shopping mall last week, 2 the 23-year
高考题型拆分组合练(二) 知识运用精准练Ⅰ.完形填空Alonzo Johnson stopped.He decided to help a(n) 1 elderly man down an escalator (自动扶梯) in a Massachutts shopping mall last week, 2 the 23-year-old