【单选题】192 You must produce 27 widgets. You can only produce 9 widgets per production run. Each production line setup costs $1000. Each widget consumes $10 worth of material and $5 worth of labor. What is to...
【单选题】In order not to miss his flight, he ran ______ the street, jumped______ the fence and dashed into the waiting hall, ______ all about his own safety. [ ]