Now the function of mechanical products, structure, shape and material of the continuous improvement, precision, produce progress by mass produce type to many varieties small batch conversion.
现在机械产品的机能，结构，外形和材料的不断的改进，精度不断进步，出产类型由大批量出产向多品种小批量转化。
To solve the problem of the variety of the main rod's size after welding to adjustable tower crane standard section, because of the difference of the material batch, a novel approach is proposed.
针对塔式起重机标准节主弦杆因材料批次不同焊接后尺寸不同的问题，提出对塔式起重机标准节主弦杆焊胎的改进方法。
In batch distillation, the composition of the source material, the vapors of the distilling compounds and the distillate change during the distillation.
间歇式蒸馏时，原料的成分、所蒸馏的化合物的蒸汽及蒸馏物在蒸馏过程中是变化的。
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