SCADA（Supervisory Control And Data Acquisition）即（）。
The data station usually means a(71)unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72)control functions.In(73)data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74)by the primary station, interprets received commands and (75) responses to be transmitted.A．performanceB．functionalC．capacityD．quality
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Network equipment supporting the use of flow control mechanisms has been recently installed. What is the purpose of flow control in a data network?()A. It ensures that data is retransmitted if an acknowledgment is not received.B. It reassembles segments in the correct order on the destination device.C. It provides a mechanism for the receiver to control the transmission speed.D. It regulates the size of each datagram segment.E. All of the above are functions of flow control
Does Krashen’s theory of second language acquisition begin with theories, or with data?
（）系统，是英语Supervisory Control and Data Acquisition的缩写，即监督控制和数据采集系统。它是一种以监督为基础的计算机控制系统。它能收集远处现场的操作信息，并通过通信线路将远方信息传送到控制中心进行显示和报告，控制中心的操作员监视这些信息，并能向远方的设备发布监督性质的命令。
SCADA的英文全称是：（）A、Super Control And Data AcquisitionB、Supervisory Control And Data AcquisitionC、Super Connect And Data AcquisitionD、Supervisory Connect And Data Asking
What are two benefits of control plane policing？（）A、protection against denial of service （DoS） attacks at infrastructure routers and switchesB、 protection against known worm attacks in routers and switchesC、quality of service （QoS） control for packets that are sourced from the data plane of Cisco routers and switchesD、quality of service control （QoS） for packets that are destined to the control plane of Cisco routers and switchesE、quality of service （QoS） control for packets that are destined to the data plane of Cisco routers and switches
在将格式化的文本文件导入oracle时我们经常采用的是SQLLOAD命令，下面正确的写法是（）。A、sqlldr username/password control=data_fileB、sqlldr username/password rows=128control=data_fileC、sqlldr username/password control=data_filerows=64D、sqlldr username/password control=data_file.ctl
