DEH系统的主要功能有哪些？
参考答案：
DEH的主要功能有如下各项：
⑴、控制功能
①运行方式控制功能。
②阀门管理（VM）功能。
③主蒸汽压力控制（TPC.功能。
④超速保护控制（OPC.功能等。
⑵、监视、保护功能
①监视与报警功能。
②危急遮断保护功能。
⑶、通信功能
DEH系统可以通过接口，与外界各种相关的控制系统相连接，实现不同的控制方式。
⑷试验功能
在运行过程中，可以通过DEH控制系统对阀门进行在线试验，也可以进行OPC试验等。
It’s Sunday. There are many 1 in the bus. And an old man is 2 here and there. He wants to find an empty 3 . Then he finds one. He goes to it. A small 4 is on the seat. And a young man is 5 it. “Is this seat 6 ?” asks the old man. “No, it’s for 7 . She goes to buy some bananas .” says the young man. “Well.” Says the old man. “Let me sit here, please. When she comes back, I will leave here.” The bus starts. “ She doesn’t come, 8 her bag is here . Let me give her the bag.” The old man throws the bag 9 of the window. The young man jumps up and shouts , “Don’t throw! It’s 10 bag.”
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