Fundamental analysis studies indicate that:（）

A. the bottom up approach to analysis will not yield superior results if the analysis only looks at past and current information.

B. the top down approach to analysis will not yield superior results if the analysis only looks at past and current information.

C. the top down approach to analysis will not yield superior results if the analysis looks at past, current and future information.

压力容器的检测手段有（）。

A、表面探伤；

B、射线探伤；

C、超声波探伤；

D、硬度测定。