下列网织红细胞概念，哪项是错误的（）
A.它是介于晚幼与成熟红细胞之间的尚未完全成熟的红细胞
B.其胞浆经特殊染色后可见蓝色网状结构即DNA
C.通常比红细胞稍大
D.通常以网织红细胞的百分率表示
E.是反映骨髓造血功能的重要指标
参考答案：B
解析：网织红细胞胞质中残存嗜碱性物质核糖核酸RNA，经活体染色后形成呈深染的颗粒状或网状结构。
Is your schoolbag too heavy? The e-schoolbag will help you. It is said that e-schoolbags are going to be brought into 43 in Chinese middle schools soon. Heavy schoolbags have been a serious 44 for a long time. But the e-schoolbag will 45 . An e-schoolbag is 46 lighter than a usual schoolbag. Perhaps, the e-schoolbag should be 47 an e-textbook. It is a small computer for students. It is as 48 as a usual book, 49 it can still have all the things for study, such as textbooks, exercise books and so on which can be made 50 chips(芯片) like stamps. The students can read the text page by page on the screen, take notes, or even send e-mails to their teachers. They only need to 51 the right chip into the e-schoolbag. Then they can use it. Some people say 52 e-textbooks can be easily broken, while others say it is not good for eyes. But only time will tell.
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