题目内容
在调节机构中采用螺距为2㎜的双头螺纹。为使轴向位移达到20㎜，螺杆应当转几转（螺母不动）？（ ）
查看答案
搜索结果不匹配？点我反馈
更多问题
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。
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（）。
微信支付 
支付宝支付