开环控制数控机床没有检测反馈装置,数控装置发出的指令信号的流程是()的。 A.单向

题型:单项选择题

问题:

开环控制数控机床没有检测反馈装置,数控装置发出的指令信号的流程是()的。

A.单向

B.双向

C.可逆

D.不确定

考点:铣工考试数控铣工考试数控铣工考试题库
题型:单项选择题

短文填空。(每空2分,共16分)根据下面短文内容,在短文的空格处填上一个恰当的词,使短文完整、通顺。

Peter was the best table tennis player in his school and hardly ever lost a match. He hated losing anything. When he 小题1:  ,he would feel really good. If he lost, he would feel terrible. It seemed to Peter that losing was the   小题2:  thing in the world .

A new kid, Albert, came to Peter’s school .He was good at table tennis, too. Soon there would be a match     小题3:  Peter and Albert. Peter worked hard to get ready for the match, but Albert didn’t seem to think   小题4:  of it. When the match began, Albert was a real player. There was always a   小题5:  on his face, while Peter looked serious all the time. Peter thought it was so important to win the match that he even wanted to cheat(舞弊) , but he lost in the end.

“ You played very well, Peter. I think we can play again sometime, ”said  Albert.

But Peter didn’t   小题6: happy and couldn’t fall asleep that night .

One day, Peter saw Albert playing basketball.   小题7:  he lost again and again, the happy smile never left his face. Peter found Albert was great at table tennis but bad at basketball. However, he enjoyed   小题8:  of them.

Whether he won or lost the game, Albert enjoyed it. Peter came to realize that enjoying a game was much more important than winning or losing it. He felt happier than ever before.

题型:单项选择题

某公司总部和3个子公司分别位于A省的4个地级市。某日,某个子公司的某台PC无法访问公司总部网络中的Web服务器。查看网上邻居,发现该PC可以访问该子公司内部的其他主机;该PC可以通过域名访问公司总部的FTP服务器。造成该PC无法访问总部Web服务器的最可能原因是()。

A.该PC的默认网关配置错误

B.该PC的DNS服务器地址配置错误

C.该PC的子网掩码配置错误

D.边界路由器配置了相关的限制ACL

题型:单项选择题

透射电镜衬度有哪几种?

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建立决策支持的关键是应对决策问题所依据的原则,对在什么情况下、在多数范围内和要求采取什么样的行动等问题进行分析,这就是______。

题型:单项选择题

钢丝绳夹头一般用()制,实际使用时,应根据出厂说明的说明选用。

A.生铁

B.铸钢

C.锻铸铁

D.熟铁

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