开环伺服系统无位置反馈装置。

题型:判断题

问题:

开环伺服系统无位置反馈装置。

考点:机电一体化系统设计机电一体化系统设计题库
题型:判断题

D

Do you know what a castle is? A castle is a building special to Europe. Castles were built in the Middle Ages by king and other powerful people who live in. Castles were used by people to protect themselves from their enemies. They are big buildings made form stone and wood.

Today there are still castles all over Europe. Some are in ruins(废墟). But some built later are still in good repair and used even today. One example is Windsor Castle, which is a home to the British queen. It is in the country or Berkshire, not far from London.

Castles have walls around them. In the old days, soldiers would stand on the walls to guard the people in the castle. If enemies came they would shoot arrows(箭) and throw stones at them. Castles also had moats. A moat is a river around the wall that makes it difficult for enemies to get in. It could be either dry or filled with water.

Other people form younger countries love European castles. In the US there are rich people who have brought broken parts of castles to their country and rebuilt them. And some people build “replica” castles---modern copies of Castle.

You probably know the Disneyland Castle in California , US. But did you know it is based on a famous castle in Germany built by King Ludwig Ⅱof Bavaria?

小题1: Which of the following is TRUE about the castle?

A.It is a special American building.

B.It is made form stone and paper.

C.Only king used to live in one.

D.People used it to protect themselves.小题2: We can tell from the story that a moat is __________.

A.a wall

B.a soldier

C.a river

D.a stone小题3:According to the passage we can know that______________.

A.There are castles only in some European countries now.

B.In the US, there used to be castles in the Middle Ages.

C.In the US, the people rebuilt the old castles or build the modern ones.

D.The Disneyland castle is built in Germany.小题4: What does the passage mainly talk about?

A.The history of castles.

B.Facts about castles.

C.The king and the castles.

D.How to build castles.

题型:判断题

The most important thing_____we should pay attention to is the first thing _____I have said.

A.which; that

B.that; which

C.which; which

D.that; that 

题型:判断题

下列估测符合实际的是  [ ]

A. 普通课桌的高度约为60cm  

B. 成年人步行的速度约为10m/s  

C. 一个鸡蛋的质量约为10g  

D. 一名中学生行走时对地面的压强约为200Pa

题型:判断题

在木材断面内部,沿半径方向开裂的裂纹叫做轮裂。

题型:判断题

高强度大六角头螺栓连接副终拧完成()应进行终拧扭矩检查。

A.后立即

B.th后,24h内

C.th后,48h内

D.2h后,48h内

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