铸造金属全冠颈部肩台的宽度为( )A.0.3~0.5mm B.0.2mm C.1. 发布时间:2018-07-12 20:03 │ 来源:www.tikuol.com 题型:单项选择题 问题: 铸造金属全冠颈部肩台的宽度为( )A.0.3~0.5mmB.0.2mmC.1.0mmD.0.5~0.8mmE.2.0mm
题型:单项选择题 Many facts proved that long before Columbus ________ America, Chinese had visited it.A.noticedB.uncoveredC.discoveredD.arrived 查看答案