Weights to be used in calculating a company’s weighted average cost of capital are least appropriately based on:（）

A. the company’s current capital structure.

B. the average capital structure weights for companies of a similar size.

C. the average capital structure weights for companies in the same industry.

可判断双嘧达莫试验阳性的是（）。

A.出现典型心绞痛，经注射氨茶碱可缓解者

B.出现ST段水平型下移≥0.1mV，持续1分钟，注射氨茶碱后30分钟内恢复原状态者

C.出现ST段抬高≥0.2mV

D.ST段在原有下移的基础上再下移≥0.1mV，持续1分钟以上

E.以上都不是