文章利用射影几何方法及配极原理给出二次曲线中点弦存在性定理的证明。
In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.
并进一步在欧氏平面上提出了一系列对偶命题和阐述标准配极对应的应用。
Moreover, we point out a series of the dual propositions and explain the application of the canonical polarizing correspondence in Euclidean plane.
本文用射影观点考察三角形的“五心”定理，通过配极变换推出五个新的命题。
The author of the essay studies the transmutation of the triangular theorem of "Five Centers" theorem from the projective viewpoint and puts forward five thoughtful propositions through polarization.
泰洛斯1号卫星在两极之间环绕地球运行，每30秒钟拍摄一张照片，如配图中的图像系列所示。
TIROS-1 orbited from pole to pole, snapping photos every 30 seconds, as illustrated in this series of images.
电除尘器采用了新的结构型式和极配型式。
The electric dust collectors are designed in a new structural mode and polarity assignment.
许多矩阵切换系统采用了三极保护继电器和配线。
Many matrix switching systems use three-pole guarded relays and wiring.
运用粉尘粒子荷电原理，对四种电晕极的主要技术性能进行了试验研究，探讨了卧式电除尘器的最佳极配形式。
By the dust particle charged theory, the test study on the main technical performance of four types of corona polars is carried, the best polar matching form of horizontal ESP is approached.
配以键盘模块及由二极管、蜂鸣器组成的报警模块，组合成较为完整的温度控制系统硬件。
Accompanied by the keyboard module and alarm module consisting of the diode and buzzer, complete temperature control system hardware is formed.
由脂肪酸锂皂稠化矿物油及配入多款极压添加剂的极压润滑脂，表现出绝佳的极压性及抗磨性。
By lithium fatty acid soap thickener mineral oil and adding a variety of extreme pressure additives extreme pressure grease, exhibit excellent extreme pressure and antiwear property.
由脂肪酸锂皂稠化矿物油及配入多款极压添加剂的极压润滑脂，表现出绝佳的极压性及抗磨性。
By lithium fatty acid soap thickener mineral oil and adding a variety of extreme pressure additives extreme pressure grease, exhibit excellent extreme pressure and antiwear property.
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