发生拉曼散射的结果将导致WDM系统中短波长通路产生过大的信号衰减，从而限制了通路数。（）
参考答案：对
Our club is open to adults only. _______your children have entered without permission. [ ]
A. There seems that
B. It seems to be
C. There seems to be
D. It seems that
20世纪教育发展总目标中的“两基”是______．
A．基本知识和基本技能B．基本普及九年义务教育，基本扫除青壮年文盲C．基本普及九年义务教育，基本实现素质教育D．基础知识和基本素质
