下列属于不稳定骨折的是（）

A.青枝骨折

B.横形骨折

C.凹陷骨折

D.斜形骨折

E.嵌插骨折

All of the following are true about the product life cycle EXCEPT:

A．It is collection of generally sequential, non-overlapping product phase

B．The last product life cycle phase for a product is generally the product’s deterioration and deat

C．Generally, a project life cycle is contained within one or more product life cycle

D．Generally, a project life cycle contains one or more product life cycle