试述绿色供应链管理的设计与实施。
安全边际指标的表现形式有（）。 ["安全边际量","安全边际额","安全边际率","保本作业率","保利量"]
用钢尺丈量两段距离：D1＝180.56 m±0.04m，D2＝254.45m±0.04m；求每段距离的相对中误差。
Your wireless network is not listed in the Connect to a network window of your computer. You need to connect to your wireless network. Which two actions should you perform?（） ["A","B","C","D","E"]
灌砂法取样部位应为每层压实后的（）深度。 ["1\/3处","2\/3处","全部","1\/3和2\/3"]
磨粒磨损
