Experimental research on uplift force acted on a piece of floor of arch invert water cushion pool and estimation to limit thrust load at skewbacks 反拱水垫塘底板块上举力变化规律的试验研究
2.
At the same time of the olympic games , paris was also hosting the word exhibition , an international fair of immense size 在举力奥运会的同时，巴黎也在主办一个规模巨大的国际展览会? ?即“世界博览会” 。
3.
What the students will actually show is the net ( resultant ) motion on the student , which is the unbalanced geometric sum of all of these forces 如学生玩滑梯，同时存在向下的重力，滑梯产生的举力（与表面垂直并向上）和阻止身体向前运动的摩擦力和空气的阻力。
4.
We decide to develop an equipment of weather balloon puffing to behoove the proper net lifting force automatically . it not only advances the precision of puffing and automatic degree of the weather balloon ' s puffing , but also eases the intensity of labour 我们研制一种气象气球自动充气装置，它能根据具体测量要求，自动将气球充气到应具有的净举力，该装置不仅能够提高充气的精度，而且减轻劳动强度，提高气球充气的自动化程度。
5.
The former has to be operated in a complex way , while the latter has a tendency to charge too much or not enough , greatly affecting the accuracy of the observation data . moreover , both drive observers so hard that they have to read the metrical data of glass and thermometer , before finding out the proper net lifting force through manual work 前者操作复杂，后者容易造成充气不足或过多，影响观测数据的准确性，而且这两种方法都需要观测人员读取气压计和温度计的测量值，再经过人工查表得出气球应具有的净举力，工作量较大。
