1. [单选题]光检测器是光接收机的核心部件，需满足响应度高，（）和响应速度快(fast response)等要求。
A. 暗电流大
B. 噪声低
C. 适用于(suitable for)多个波长
D. 色散大
2. [单选题]A Next Generation Network(NGN) is a (上题选择) network ,which is able to provide Telecomunication Services ti users and to make use of multiple broadband, QoS-enable transport technologies and in which service-related functions are () of the underlying transport-related technologies.
A. dependent
B. independent
C. related
D. depend
