Had it been possible, I would have gone to attend Monica in the hospital, but I  fully occupied last month.

A．had been

B．was

C．am

D．have been 过去相反，

在快速输血前或输血过程中，用下列哪种方法加温，库血发生溶血的可能性最小()

A．放射线波加温器

B．水浴加温器

C．微波加温器

D．电磁加温器

E．干热加温器