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。

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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。

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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。

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This ETF is designed to move double in the opposite direction of the euro relative to the dollar.

FORBES: Trade Currencies Like Soros

You can also play the cratering yen via the YCS, which moves double in the opposite direction of the Japanese currency relative to the U.S. dollar.

FORBES: Japan Gets A Jolt As Kuroda Goes With Q.E. That Would Make Ben Bernanke Blush

They sold completely out of UltraShort Health Care ProShares, an exchange-traded fund that moves double in the opposite direction of the Dow Jones U.S. Health Care Index.

FORBES: Magazine Article