The network administrator must complete the connection between the RTA of the XYZ Company and the service provider. To accomplish this task, which two devices could be installed at the customer site to provide a connection through the local loop to the central office of the provider (Choose two.)()。
A. WAN switch
B. PVC
C. ATM switch
D. multiplexer
E. CSU/DSU
F. modem
当手机在作小区重选时,需要与MSC/VLR之间传递信息吗?
技术作为知识,体现于设计、工艺、制造过程之中,是()。
A. 活动过程
B. 一种器物
C. 一种组织或建制
D. 科学理论的具体化
探放老空水前,首先要分析查明老空水体的空间位置、积水量和水压。
A. 正确
B. 错误