精品文献
懒人仰卧起坐机有用
便携式多功能仰卧起坐计数器材
便携式多功能仰卧起坐计数器材
讲述便携式多功能仰卧起坐计数器材的结构设计和工作原理。可以实现计数和计时的功能;用上身去感应光电开关的方式,可以保证使用者动作的规范性;躺板可以伸缩和折叠,使得携带更加方便。
钢结构计算初有用
According t o Office Party of mass li ne educati on practi ce a ctivities le d group of unified arra ngement s, units main le d to for cadre s worker s Sha ng a times party le cture, due to himself level limited, only put thi s stage concentrat ed lear ning of experie nce t oday a nd every one common with l earni ng excha nge, purpose is l et we further dee p under standing mass li ne of connotati