直角

Note that this ratio does not depend on the particular right triangle chosen, as long as it contains the angle A , since all those triangles are similar.

把直角三角形的弦放在直径上，股就是长的弦，即正弦，勾就是短的弦，即余下的弦——余弦。

Xi Brushes must be installed square to the commutator/slip ring.

炭刷必须和换向器/滑环成直角。

The front shield cover of the step serves to prevent slipperiness and attract the attention. It has flat and rectangular edge mouth.

踏步的前护板 front shield cover起防滑和注目作用，有平沿口和直角沿口。

The sensor filtering algorithm utilized in the Reference Cartesian Coordinate System is presented for target tracking when the sensor measures range, bearing, and elevation angle in the Spherical Coordinate System.

在感测器方面，感测器在球面座标系中测机动目标之距、方位与俯仰角，转换至参考直角座标系(Reference Cartesian Coordinate System)。

It is not conformable with many images on the surface such as cylindrical map image,spherical map image,which can be found in reality.

而现实中往往可见到许多曲面上的图像，比如柱面帖图、球面帖图，处理此类图像采用基于直角坐标系的微分算子显然不能胜任。

I still have to fabricate the remaining port/starboard, angled bulkheads and glue them in place.

我仍然要捏造事实，其余港口/右舷，直角舱壁和胶水他们在的地方。

By using constructing elements between GPS net work point and state control point determined by ordinary survey instruments and making use of converting formula of the WGS-84 coordinate system and occupation station original based grid system, the WGS-84 coordinates of the state control point were calculated.

针对GPS控制网与国家控制点联测时遮挡严重的问题，提出了一种虚拟基线的方法，即通过常规方法测出GPS网中某点与国家控制点之间的基线构造元素，并利用WGS84地心坐标系与站心地平直角坐标系之间的转换模型计算出国家控制点的WGS84地心坐标，然后根据GPS商业处理软件的基线格式构造出GPS网中某点与国家控制点之间的虚拟基线，并入整个GPS控制网中进行平差解算。

Have the ability of oral arithmetic and be familiar with right angle and straight angle.

能有一定的口算能力，对直角、平角等比较熟悉。

A right angle is an angle of 90°,and a straight angle is one of 180°.

直角是90°角，平角是180°角。

To test for conformity to a desired plane, straight line, or right angle.

调整：为得到符合要求的平面，直线或者直角而测试

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。