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The valve seat ring - welded seat ring is perpendicular to flow path, easy to maintain.

4阀座环–焊接阀座环垂直于流动通道，易于维护。

Turn handle to be perfectly perpendicular to valve body.

将手柄旋转到与阀体完全垂直的位置。

Equal, the other is that the two slopes are perpendicular to each other. In the first case, the minimum overburden equals 0.565 6 times of water head of the tunnel, which is consistent with the modified Norway rule.

山体的2个坡角都为45°时，隧洞的最小覆盖厚度是水头高度的0.565 6倍，这与修正的挪威准则给出的结果相同。

Assumption of plane waves radiating from a point source leads to two rotational components: rocking around a horizontal axis perpendicular to the source-site direction and torsion around a vertical axis.

点源面波辐射假设产生了两个旋转分量：绕水平轴垂直于震源-场地方向的摇摆及绕垂直轴的扭转。

During the New Moon (the 1st of a lunar month) and the Full Moon (the 15th of a lunar month) when the Earth, Moon, and Sun lie in a straight line, the solar and the lunar tides overlap and the sea-level pressure is lower than the mean at the Airport, because the tide-producing force induced by the Sun and Moon reaches maximum. On the other hand, during the First Quarter (the 7th day of a lunar month) and the Last Quarter (the 21st of a lunar month) the Sun-Earth's and the Moon-Earth's relative positions are perpendicular to each other with respect to Earth, the solar and the lunar tides interfere mutually, the Airport sea-level pressure is greater than the annual mean due to the tide-producing force reaching minimum.

松山机场在朔望月里，每逢阴历朔日或望日，受太阳与月球之引潮力(Tide-producing force)方向一致，太阳潮和太阴潮重叠影响，其全日和逐时平均海平面气压比年平均为低；而每逢上弦和下弦时，日地与月地的相对位置成直角，太阴潮和太阳潮相干扰，其全日和逐时平均海平面气压则比全年平均为高。

To further study this problem, the optical axis is rotated by an arbitrary angle. A striking phenomenon is discovered that the Brewster angle is always equal to the rotation angle. This is because the waves in the direction perpendicular to the optical axis become evanescent since the permittivity is positive while the permeability is negative in this direction.

然后进一步的研究了主轴不垂直于界面的情况，发现主轴转动的角度恰好等于此时的Brewster角，这是因为此时垂直于主轴的方向上介电常数为正磁导率为负，只有倏逝波而没有可传播的波存在，因此反射系数为0。

To ensure aburning surface that is perpendicular to the strand vertical axis, thetip of the strand was filed flat.

以确保燃烧的表面是垂直于钢绞线垂直轴，提示该钢绞线备案的单位。

Traditionally we continue moving forward with the paper in line with the direction of most of the fibers'packing is called straight grain direction; and a direction perpendicular to the horizontal paper called the grain direction.

习惯上我们把与造纸前进方向一致的大部分纤维排列的方向叫做直丝绺方向；与其垂直的一方向叫做纸张的横丝绺方向。

Because the torque is propagated along an axis that is PERPENDICULAR TO AND INTERSECTS with the steer axis, there are no forces generated that could rotate the fork for steering.

由于扭矩的宣扬沿轴是垂直相交，并与指导轴，没有任何力量可以产生旋转叉指导。

It was supplied with two rows of seats, perpendicular to the direction of the train on either side of an aisle which conducted to the front and rear platforms.

这样的装置使列车能在转弯角度较小的路线上，顺利前进。车厢内部根本没有分隔起来的旅客房间，只是从正中间分隔开，整齐地排着两行靠背椅。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。