In the context of company law, explain and distinguish between annual general meetings, extraordinary general meetings, and class meetings. (10 marks)

目前临床报告细菌性输血反应很少的主要原因是（）。

A.临床诊断的技术条件不完备

B.血液质量提高，细菌污染血液减少

C.临床医生对细菌性输血反应认识不足

D.应用塑料血袋采血和分离制备血液成分

E.报告渠道不通畅