颈椎病的手术指征是()

A．颈痛伴手麻木

B．头痛、头晕、眩晕

C．反复发作，症状严重，长期保守疗法无效，有脊髓受压或瘫痪

D．颈肩痛，手部肌力减弱，头痛头晕，耳鸣

E．颈肩痛较重，手握力减退，X线片有骨棘生成，椎间隙狭窄

（）from one phase are usually reviewed for completeness and accuracy and approved before work starts on the next phase.

A.Process

B.Milestone

C.Work

D.Deliverables