Question 28 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question.Now listen to the news.

A．He made a public appearance.

B．He published a book telling the truth.

C．He was found in a picture of a film.

D．He received an interview by a TV reporter.

以下有关加氢裂化装置应力腐蚀的表述正确的是（）。

A、拉应力只能来源于金属内部的残余应力。

B、残余应力的产生不是由于加工过程中产生的形变，就是升温后冷却降温不均匀。

C、主要的应力腐蚀类型是湿硫化氢腐蚀和连多硫酸腐蚀两种。

E、均不正确