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【简答题】一普通螺旋传动机构(如下图),双线螺杆,螺距为6mm ,右旋,求: (1)螺杆如图所示方向旋转,螺母向何方向移动, 请在图上标出。 (2)螺杆转两周,螺母移动距离为多少?
【简答题】Your
achievement is the ________of years of hard work, both of your own and of your
parents and teachers.
【简答题】attain pledge triumph overwhelmed reap Your achievement is the ____ of years of hard work, both of your own and of your parents and teachers.
【简答题】Your achievement is the ________ of years of hard work. 胜利、成功、成就
【判断题】Your achievement is the triumph of years of hard work, both of your own and of your parents and teachers. Meaning: your entering this university is an important success. The success is not due to many...
A.
正确
B.
错误
【简答题】社会主义制度在中国基本确立的标志是（ ）。
【简答题】如下图所示双螺旋传动中,螺旋副a:Pha=2mm,左旋;螺旋副b:Phb=2.5mm,左旋。求:(1)当螺杆按上图所示的转向转动0.5周时,活动螺母2相对导轨移动多少距离?其方向如何?(2)若螺旋副b改为右旋,当螺杆按上图所示的转向转动0.5周时,活动螺母2相对导轨移动多少距离?其方向如何?
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