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.
该文系统地讨论二极管工作在开关特性下所组成电路的频率变换的工作原理。
This paper tries to discuss the work principle of frequency transformation on the circuit where diodes work on on-off speciality.
论述了极指数栅格坐标和极对数坐标变换原理以及在测距方面的应用。
This paper described the transformation theory of polar_log grid coordinate and its application to distance_measuring.
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