题目内容
滑动螺旋传动中，从动件的直线移动方向不仅与主动件转向有关，还与螺纹的旋向有关。
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机床采用双线螺纹，螺距为4mm，设螺杆转4周，则螺母移动距离为（）mm。
Listen to teh passage and fill in the blanks with the missing words.Where Do Dreams Come From?Do you often dream at night? Most people do. When they 1) ___________in the morning they say to themselves,“What a strange dream I had! I 2)_________ what made me dream that."Sometimes, dreams are frightening. Terrible things threaten and 3)______________us, we can't break away from them. Sometimes, in dreams wishes 4)_________ We can fly through the air or float from the tops of mountains. At other times, we are 5)____________by dreams. We are lost and cannot find our way home. In dreams we 6)___________very strangely. We do things which we would never dowhen we are 7)___________We think and say things we would never think and say. Why are dreams so strange? Where do dreams 8)__________ ?[音频]
螺纹联接预紧的主要目的是（）。
常用的螺纹防松方法有（）。
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