Firstly, utilizing the reverse screw, the characteristics of instantaneous motion of 3-RRRRR parallel mechanisms under its initial position and under the general condition were analyzed.
首先用反螺旋分析了3 -RRRRR并联机构在初始位置下和在一般情况下的瞬时运动特性。
The general situation of the Sandlake tourism area Ningxia is introduced , including the geographical position , the condition of the natural resources , the condition of environment.
详细介绍了宁夏沙湖旅游区的基本概况，包括旅游区的地理位置、自然资源条件、环境状况等。
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