题型:选择题 --Late again !--Sorry. I was ________ halfway for half an hour on my way to work this morning.A.broken downB.held upC.cut downD.closed up 查看答案
题型:单项选择题 CRTSⅡ型板式无砟轨道基准点之间的相对精度应满足()A、平面0.3mm,高程0.2mmB、平面0.2mm,高程0.1mmC、平面0.2mm,高程0.2mmD、平面0.3mm,高程0.5mm 查看答案