销售点实时管理系统，即（）系统，为实时控制经营活动提供了帮助。
A．OCR
B．MIS
C．EOS
D．POS
参考答案：D
Not only ______ prepare lunch for us, but also _______ clothes for us.
A．he did , he washed
B．he did , did he wash
C．did he , he washed
D．did he, did he wash
通过精细色散管理、EFEC、RAMAN 放大器等技术，Opitx BWS 1600G 系统能够实现2000Km无电中继传输，通过Super WDM技术，可以实现4000km以上中继传输。
