选择题：( )2 Toyworld is a profitable toy retailer in Seat

题目内容：

　　( )2 Toyworld is a profitable toy retailer in Seattle, US, with subsidiaries in over 30 countries.
　　A. basing B. base C. basis D. based

参考答案：【答案仅供学习，请勿对照自行用药等】

( )4 Bob and Tony are business and have arranged t

( )4 Bob and Tony are business and have arranged to meet at the sales conference

要求互相了解对方的利益要求，寻求双方利益的共同点，并努力使双方的共同利益得到实现，这是关系营销的（D）特征。

5. Export companies often have a separate export sales force, whose travel and a

四．论述题1．试推导下图内的脉冲当量δ与步距角α的关系式，假设已知各齿轮齿数和丝杠的导程。由于脉冲当量是规定的，步进电机一经选定后，其步距角也是一定的，试回答如