估算机器设备的实体性贬值主要有哪些方法？
参考答案：
观察法、年限法、修复费用法。
如图所示，如果轮胎有箭头则表示其方向性，左右车轮可以互换安装
Project（）Management is the Knowledge Area that employs the processes required to ensure timely and appropriate generation, collection, distribution, storage,retrieval, and ultimate disposition ofproject information.
A.Integration
B.Time
C.Planning
D.Communication
