问题详情

What is the main purpose of the lecture？

A．To discuss recent innovations in laboratory equipment

B．To give an example of a practical use for a particular scientific technique

C．To familiarize students with the chemical composition of paint pigments

D．To show how researchers were able to restore a particular work of art

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！