题目：
钢管桅杆常用的立、拆方法有（）。
A、滑移法
B、旋（扳）转法
C、正装（拆）法
D、倒装（拆）法
答案：
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参考答案：一是有买方价值的差别化延续；二是竞争对手难以模仿你的差别化行为
钢管桅杆常用的立、拆方法有（）。A、滑移法 B、旋（扳）转法 C、正装（拆）法 D、
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