The advantage and application of double direction meridian line net shell structure of fixed roof for large diameter storage tank are introduced emphatically.
重点介绍了大直径储罐固定顶盖中双向子午线网壳结构的优点及应用情况。
The double direction alternate control strategy is applied to reduce the blindness of the target selected and approved for improving the reasoning efficiency.
利用双向交替控制策略减少选择目标和证实目标的盲目性，提高了推理效率。
According to the theory of single cylindrical helical torsional spring, the cylindrical helical spring in double direction was designed to realize the test of torsion.
利用单个圆柱螺旋扭转弹簧扭转原理，给出了一种用双向扭转圆柱组合螺旋弹簧实现扭矩测试的方法。
When the equipment energy is limited, the repeated compaction and the double direction compaction are efficient ways to manufacture homogeneous and high-density powder parts.
当设备放电能量有限时，重复压实和双向压实方法是获得致密均匀、高密度粉末制品的有效途径。
YRT series cylindrical roller and thrust needle roller combined bearings, with high rotation accuracy, can support heavier radial loads, double direction axial load and inclined torque, etc.
圆柱滚子和推力滚针组合轴承yrt系列具有旋转精度高、可承受较大的径向载荷和双向轴向载荷以及大的倾覆力矩等特点。
Then this text analyzed from two aspects how to proceed the construction of the mathematics concept: construction of the double direction and construction from concrete to abstract to concrete.
接着从两个方面分析了如何进行数学概念的建构：双向建构和“具体—抽象—具体”建构。
Double-direction oil way design provides stability and reliability.
双向油路设计，稳定可靠。
English Name:Rolling bearings - Angular contact radial ball bearings - Part 4: Single row, double-direction - not self-locking, with double-split inner ring (Four-point contact bearing)
简体中文标题：滚动轴承。单列非自保持径向止推球轴承。带可分解内环的四点支承滚动轴承。
Four-column type double-direction guiding and crank connecting rod synchronized balance mechanism are adopted to guarantee equal force in the cutting area of machine.
采用四柱式双寻向和曲柄连杆同步平衡机构，保证冲裁区域受力均匀。
Four-column type double-direction guiding and crank connecting rod synchronized balance mechanism are adopted to guarantee equal force in the cutting area of machine.
采用四柱式双寻向和曲柄连杆同步平衡机构，保证冲裁区域受力均匀。
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