题目内容
机械传动中最主要、应用最广泛的一种传动是()，并且它是依靠主动齿轮依次拨动从动齿轮来实现的。
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机械设备的种类很多，分类方法也很多。通常按()可以分为通用机械设备、大型联动生产设备(专用机械设备)和非标准设备等。
Files can be lost or destroyed accidentally. Keep(74)copies of all data on removable storage mediA.
听力原文：W: This food is terrible! I can't even finish my dinner.
M: I know. You think with all the money we paid for room and board, the university could hire a better food service？ Where are you headed next？
W: I'm going over to the student recreation center to play some bridge.
M: You are spending your time on a card game？
W: Not just any card game. It's one of the most strategic there is.
M: So I have heard. Don't you play with a partner？
W: Yeah! Four people play, two against the other two.
M: So, you try to play in cooperation with your partner.
W: Actually, the cards of one of the four players are turned face up. That player is called the dummy.
M: I wouldn't want to be called that. When you are the dummy, what do you do while the cards are being played？
W: Anything you want. Sit there and study, shuffle another deck, get snacks for everyone ... I like to stand behind my partner and watch.
M: You know, I've heard that bridge is habit-forming. You should be careful not to play so much that you don't get your studying done.
W: Don't worry about me. I only play Thursdays after dinner, and sometimes when they need a forth player. If you like, I could teach you.
M: Thanks, but I have a pretty heavy workload this semester. I already spend my evenings doing things I don't really know how to do yet.
Where does the conversation take place？
工程测量平面控制网的坐标系统，应满足测区内投影长度变形值不大于()cm/km。
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