单项选择题
（）is more accurate and easier than Fixed Interval System ( FIS ) in the order method.
A.Fixed Quantity System B.Fixed Timing System C.Fixed Channel System D.Double-note system
单项选择题 （）has three specific points: fixed line and announcing shipping time in advance.
单项选择题 （）is very convenient equipment for loading and unloading goods.
单项选择题 The area for unloading goods in warehouse is（）
