同步回路通常有几种控制方法？哪种方法同步精度最高？_爱下问搜题

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问题问答题简答题

同步回路通常有几种控制方法？哪种方法同步精度最高？

答案

参考答案：

同步回路的控制方法一般有三种：容积控制、流量控制和伺服控制。

容积式同步回路如串联缸的同步回路、采用同步缸（同步马达）的同步回路，其同步精度不高，为此回路中可设置补偿装置；流量控制式同步回路如用调速阀的同步回路、用分流集流阀的同步回路，其同步精度较高（主要指后者）；伺服式同步回路的同步精度最高。

完形填空

One summer several years ago, my family was enjoying a barbecue on the beach. After the barbecue, my father-in-law invited me to go fishing. Fishing was his hobby, but I   36  went fishing. We walked a little way along the beach and reached a rock by the shore, and I    37   the hook into the sea from there. Frankly speaking, I am a (n)   38  person, and although I had not felt a tug (猛拽) on the line, I reeled up the hook after five minutes or so. I had caught    39 . It was a starfish. It trembled uneasily when I   40  the hook from its ugly mouth. I threw the starfish back into the sea. After another five minutes I caught another starfish and I threw it back again.
After a while, I caught yet another starfish. That was 41 time, and this time I really got angry. I hit the starfish on the rock   42  throwing it into the sea. I was not in the   43  to continue fishing any more.
When I was   44  the fishing tools, I noticed a little girl looking at the starfish on the rock. We   45  looks with each other. The little girl spoke to me in a   46  voice. “Sir, would you mind if I   47  the starfish back into the sea?”“Not at all,” I replied. “"But you know, there are too many starfish in the sea, and they eat many shellfish.   48 , they look so ugly. I don't like them.”
“I understand,” said the little girl. “But if the starfish cannot get back to the sea, it will be   49  by the sun and die. My dead grandfather once told me that there are no living creatures that have no right to exist in the world. God   50  every creature because it was needed by nature. Poisonous snakes, spiders, and starfish were born into this world with a certain   51  for their existence.”
“All right, dear, please throw the starfish back into the sea,” I said to the little girl, feeling   52 . The girl picked up the starfish and gently put it into the sea, and she  53  at me and said, “Thank you, sir.”
Many people like "cute" creatures such as dogs, cats, and rabbits, while they tend to dislike “ugly” creatures such as snakes, spiders, and starfish. However, the “cuteness” and “ugliness” of things are decided   54  only on one’s personal opinions. There are no living creatures that have no 55  in the world-- this is what I learned from the little girl.

A．putting off

B．putting out

D．putting away

C．experienced

A．very satisfied

B．a little ashamed

C．quite angry

D．a bit tired

单项选择题

下列指令中，不合法的指令是( )。

A．PUSH BL

B．INT 23H

C．IN AX，03H

D．ADC BX，[SI]