前置机系统担负着与厂站、RTU和各分局的（）等任务。A、保存所有

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问题单项选择题

前置机系统担负着与厂站、RTU和各分局的（）等任务。

A、保存所有历史数据；

B、对电网实时监控和操作；

C、数据通信及通信规约解释；

D、基本SCADA功能和AGC/EDC控制与显示；

答案

参考答案：C

阅读理解

阅读理解。

Li Hai is from a family of three people. They like to eat different kinds of food. Li Hai likes hamburgers

very much. He likes to have them for every meal. But he doesn't like vegetables at all. Li Hai's father is

from Guangdong. He likes rice very much. But he doesn't like meat at all. Li Hai's mother is from Dalian.

She likes fish and vegetables very much, but she doesn't like rice or hamurgers. They all like fruit.

根据短文内回答问题。

1. How many people are there in Li Hai's family?

_________________________________

2. Does Li Hai like hamburgers?

_________________________________

3. What does his father like?

_________________________________

4. What doesn't his mother like?

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5．Do they like fruit?

_________________________________

单项选择题

黄土湿陷最主要的原因是其存在什么结构？（）

A.絮状结构

B.单粒结构

C.蜂窝结构

D.多孔结构