在PowerPoint中,演示文稿与幻灯片的关系是( )。
A. 演示文稿即是幻灯片
B. 演示文稿中包含多张幻灯片
C. 幻灯片中包含多个演示文稿
D. 两者无关
PowerPoint2010演示文稿文件的扩展名是( )。
A. pptx
B. potx
C. xlsx
D. htm
Which of the following cells do NOT have the biconcave disc shape?
A. fibroblast
B. chondrocyte
C. mature erythrocyte.
D. reticular cell
E. immature erythrocyte in the bone marrow.