一旦PRIMARY应急关断控制单元出现故障，SECONDARY应急关断控制单元将自动切换为（），故障应急关断控制单元将自动切换为故障安全状态，同时发出故障报警信号等待维修A、离线备用B、关停C、在线控制D、在线热备
一旦PRIMARY应急关断控制单元出现故障，SECONDARY应急关断控制单元将自动切换为（），故障应急关断控制单元将自动切换为故障安全状态，同时发出故障报警信号等待维修
- A、离线备用
- B、关停
- C、在线控制
- D、在线热备
相关考题：
Copper losses are _____ losses in the primary and secondary windings of the transformer core. A、inductiveB、capacitiveC、resistiveD、reactive
How many IP addresses can be configured in a given interface?（）A、one primary and one secondary IP addressB、one IP addressC、as many IP addresses as you wantD、one primary and multiple secondary IP addresses
涠12-1油田应急关断PLC通信模块1785-BCM面板上有五个状态指示灯，SEC表示SECONDARY运行方式，绿灯显示：（）A、1785-BCM模块与I/O底板正在进行数据传输B、当前PLC为SECONDARY PLCC、1785-BCM通信模块与处理器间没有通信D、硬件故障
涠12-1油田应急关断控制系统主要由（）构成A、应急关断PLC处理器1785-L40E、PLC通讯卡1785-BCM、互为冗余的两块PLC电源卡1771-P4R和PLC的输入输出单元应急关断REMOTEI/OB、应急关断PLC处理器1785-L40E、互为冗余的两块PLC电源卡1771-P4R和PLC的输入输出单元应急关断REMOTEI/OC、PLC通讯卡1785-BCM、互为冗余的两块PLC电源卡1771-P4R和PLC的输入输出单元应急关断REMOTEI/OD、微型机算计、ALLEN BRADLEY PLC5/40E可编程控制器、REMOTEI/O、报警盘、打印机、HUB等
AP平台中控系统对A平台和AP平台的生产过程进行（）A、集中监视、应急关断操作、分散管理和控制B、集中监视、应急关断操作、管理和分散控制C、集中监视、控制、管理和分散应急关断操作D、集中监视、应急关断操作、控制和分散管理
涠12-1油田应急关断PLC通信模块1785-BCM面板上有五个状态指示灯，SER表示SERIAL COMMUNICATION，绿灯闪亮：（）A、1785-BCM模块与I/O底板正在进行数据传输B、当前PLC为SECONDARY PLCC、HSSL通信无误D、硬件故障
单选题The customer brings their mini-tower and a new DVD/RW drive they want installed. The technician finds a second hard drive in an empty 5.25 bay connected to the secondary bus and jumpered as a slave. The ribbon cable will not stretch from the primary hard drive to the open 5.25 inch bay. Which of the following is the BEST solution?（）AConnect the new DVD drive as the primary on the secondary bus and leave the old CD drive disconnected.BMove the secondary hard drive next to the primary hard drive and connect to the primary bus. Connect the new DVD drive as the slave on the secondary bus.CMove the secondary hard drive from the secondary to the primary bus and then reformat the hard drive after rebooting then reassign the drive letters in disk management prior to installing the new DVD drive on the secondary bus.DMove the secondary hard drive to the bay and then connect it to the primary bus. Connect themini-tower and the new DVD drive as the master on the secondary bus.
单选题How many IP addresses can be configured in a given interface？（）Aone primary and one secondary IP addressBone IP addressCas many IP addresses as you wantDone primary and multiple secondary IP addresses
单选题What is the main idea of this passage?AThe difference between the primary school and the secondary school.BThe method that pupils get help from the teachers.CThe personal development of the pupils in the secondary school.DThe function of the secondary school.