电缆导体实际载流量应计及敷设使用条件的差异的影响，规范要求下列哪些敷设方式应计入热阻的影响？（）

A.直埋敷设的电缆

B.敷设于保护管中的电缆

C.敷设于封闭式耐火槽盒中的电缆

D.空气中明敷的电缆

Which of the following is NOT an advantage of technical analysis()

A. It does not depend on the analysis of market trading data, such as security prices and trading volume.

B. It is relatively easy to implement.

C. It tells the analyst when to buy, but not necessarily why investors are buying.