问题
问答题 简答题
车床装配调试完毕，要精车零件并进行圆度和圆柱度检查，精车螺纹并进行螺距检查，其目的是什么？
答案
参考答案：
精车零件外圆后进行圆度和圆柱度试验的目的是检验机床在正常温度下，机床主轴轴线对溜板移动方向的平行度及主轴的旋转精度。
精车螺纹后检验螺距的目的是检验加工螺纹传动系统的准确性。
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车床装配调试完毕，要精车零件并进行圆度和圆柱度检查，精车螺纹并进行螺距检查，其目的是什么？
参考答案：
精车零件外圆后进行圆度和圆柱度试验的目的是检验机床在正常温度下，机床主轴轴线对溜板移动方向的平行度及主轴的旋转精度。
精车螺纹后检验螺距的目的是检验加工螺纹传动系统的准确性。
| 阅读理解 | |
Most of us express dissatisfaction with our memory, especially when we want to recall some detai l and we can't.Some examples are, an address or a telephone number, the time of a meeting, somebody's name, etc.Even people who I think have an excellent memory, complain that they forget things.Memory works like a bank.You can get to it, only if you put it there.If you didn't deposit it, you can't collect it when you need it.It is described what we need to do to improve our memory in this article. 2. ____ Recall of a particular event or detail depends on the interest we take and the importance we assign to that detail or event, at the time when it is taking place.We remember so much more about people, places, and topics which fascinate us.When you are greatly interested in a subject, you pay close attention and your brain releases chemicals to form deeper "imprints" on the cells that store memory. 3. ____ The more active attention you pay, the more details you observe, the more you think, reason, and comprehend, the more associations you make of what you know with what you are trying to learn, the more you will retain and be able to recall, later on.Good memory is a state of the active mind. 4. _____ Learn with a relaxed mind.Recall the learned material with a relaxed mind.Let's take as an example a situation where you misplace your car keys.If you get too anxious about yourself in trying to recall something, as is the case in this example, you are in for frustration.But, if you relax your mind, and calmly go through the events backward, you are more likely to remember where you left them. 5. _____ Depression can make the interest and joy less in th  e events surroundings us.As a result, too little energy is left to recall anything.Some depressed persons become more anxious and depressed thinking, "I have lost my mind." Once depression is treated, memory as a general rule, returns to the normal. |
