病历摘要：男，62岁，劳累性心前区疼痛，胸闷、气促半年。休息后缓解，服用硝酸甘油，复方丹参片后有缓解，无下肢水肿，无夜间端坐呼吸

为明确诊断最有诊断价值的检查是：（）

A.心电图

B.运动实验心电图

C.24小时动态心电图

D.超声心动图

E.胸部正侧位片

F.胸部CT

G.冠状动脉造影检查

H.心脏同位素扫描检查

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