求翻译：根据设计张拉力的大小选择吨位、行程适宜的千斤顶及与之配套的高压油泵和油表，因为预应力值的准确性对梁体质量的影响至关重要，所以，张拉施工之前必须校核张拉设备，张拉机具必须由专人操作。是什么意思？

Tension is designed to choose the size of the tonnage, stroke suitable jack and accompanying high-pressure pump and fuel gauge, because the value of the accuracy of pre-stressed body mass of the beam is critical, therefore, the tension must be checked before construction tensioning devices, tensioni

According to the design Chang drag the sizes suitable for the 1000 tonnage, the itinerary Sino-Russian relations seriously and to form a complete set of high-pressure oil pump and oil meter, because the accuracy of Mr LEUNG Commonwealth prestressed value effects on quality is essential, therefore, C

According to design tensioning force size choice tonnage, traveling schedule being suitable hoisting jack and with it necessary high pressure oil pump and oil gauge, because the pre-stressed value accuracy is very important to the Liang physique quantity influence, therefore, opens pulls before the

Tensioning force size selection of tonnage under design, tour suitable for Jack and its accompanying fuel pump and gauge because accuracy of prestress influence on Liang Ti quality essential, so construction must check before tensioning device, tensioning tools must operate by hand.

Tension is designed to choose the size of the tonnage, stroke suitable jack and accompanying high-pressure pump and fuel gauge, because the value of the accuracy of pre-stressed body mass of the beam is critical, therefore, the tension must be checked before construction tensioning devices, tensioni