晚期囊胚透明带消失后，相当于受精后第几日开始着床
A．2～3天
B．4～5天
C．6～7天
D．8～9天
E．10～11天
参考答案：C
请画出常一中流程图。
__( )__ processing offers many ways to edit text and establish document formats. you can easily insert, delete, change, move and copy words or blocks of text.
A．Data
B．Database
C．Word
D．File
