关于电力设备和线路短路故障的主保护的说法，( )是正确的。 _爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

关于电力设备和线路短路故障的主保护的说法，( )是正确的。

A．高频保护；
B．阶段式距离保护；
C．光纤纵联差动保护；
D．能满足系统稳定和设备安全要求，能以最快速度有选择地切除被保护设备和线路故障的保护。

答案

参考答案：D

选择题

Beethoven is my favorite musician. I regard him ______ other musicians.

A．more superior to

B．more superior than

C．superior to

D．superior than

完形填空

In the doorway of my home, I looked closely at my 23-year-old son, Daniel. In a few hours he would be flying to France to   36 a different life. It was a transitional（过渡的）time in Daniel's life. I wanted to    37  him some words of significance. But nothing came from my lips, and this was not the    38 time I had let such moments pass.
When Daniel was five, I took him to the bus stop on his first day of kindergarten. He asked, “What is it going to be like, Dad? Can I do it?” Then he walked   39  the steps of the bus and disappeared inside. The bus drove away and I said nothing. A decade later, a similar   40 played itself out. I drove him to college. As I started to leave, I tried to think of something to say to give him    41 and confidence as he started this new stage of life. Again, words 42 me.
Now, as I stood before him, I thought of those 43  opportunities. How many times have I let such moments   44 ? I don't find a quiet moment to tell him what they have 45 to me. Or what he might   46  to face in the years ahead. Maybe I thought it was not necessary to say anything.
What does it matter in the course of a lifetime if a father never tells a son what he really thinks of him?    47  as I stood before Daniel, I knew that it did matter. My father and I loved each other. Yet, I always   48  never hearing him put his   49   into words. Now I could feel my palms sweat and my throat tighten. Why is it so   50 to tell a son something from the heart?
My mouth turned dry, and I knew I would be able to get out only a few words clearly. “Daniel,” I said, “If I could have picked, I would have picked you.” That's all I could say. He hugged me. For a moment, the world    51 , and there were just Daniel and me. He was saying something, but tears misted my eyes, and I couldn't understand what he was saying. All I was    52 of was the stubble（短须）on his chin as his face pressed   53  mine. What I had said to Daniel was   54 . It was nothing. And yet, it was 55 .

B．instruction

B．discouraged

B．embarrassing

A．disappeared