简答题
数控车床的机械结构组成及结构有什么特点。
简答题
数控机床对进给系统有哪些要求？
简答题
经济型数控车床的有什么特点？
简答题
数控机床的主轴变速方式主要有哪些？
简答题
加工中心和数控铣床的最大区别是什么？
简答题
滚珠丝杠螺母副在数控机床上的作用是什么？滚珠丝杠螺母副的特点有哪些？
简答题
数控机床机械结构的主要组成有哪几部分？每部分的功能是什么？
填空题
Henry, who works in a company, invites Mandy, his colleague, to take a picnic with him.
Henry: Hey, what are you doing this weekend?
Mandy: I 1 yet. What about you?
Henry: 2 to go for a picnic? 1 The weather forecast says it will be sunny this Sunday.
Mandy: That's a good idea 3 anything?
Henry: Yes, of course, and 4 make some hamburgers.
Mandy: OK. Then I'll bring some drinks, green tea, black tea, juice or cola?
Henry: How about 5 ? By the way, I will bring my new kitchenware for our picnic.
Mandy: New kitchenware? A cooker?
Henry: Yeah! I just bought a solar cooker last month. It's a new device that uses solar energy and it is getting popular due to its high efficiency and its environmental friendliness. People can cook easily with this new device. I'll bring some fruit and some other food. We will have a wonderful picnic!
Mandy: Wow! How amazing! I can't wait!
Henry: OK, I am 6 to our picnic! Then see you on this Sunday!
Mandy: See you!
单选题
What did Henry invite Mandy to do with him?
He invited her to the concert.
He invited her to the movies.
He invited her to go for a picnic.
单选题
What will the weather be like this Sunday?
It will be sunny.
It will be rainy.
It will be cloudy.