产后宫缩痛下列哪项正确

A．产褥早期，因宫缩引起的下腹部阵发性疼痛

B．一般产后4～5天出现，持续1周自然消失

C．初产妇比经产妇多见

D．活动可使疼痛加剧

E．哺乳时疼痛可缓解

Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists ofthree steps. The first step is (6) . It determines how the various results are computed by the product and presents this information in the form of a (7) and associated scenarios. The second is (8) , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is (9) , which determines the actions performed by or to each class or subclass and presents this information in the form of (10) .

A．activity diagram

B．component diagram

C．sequence diagram

D．state diagram