Harmonic Motion: experimental board, spring weight, loaded board, counterpoise, stopwatch.

简谐运动：实验板，弹簧秤，载重板，砝码，码表。

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Experimental introduction of the SP3 system board structure and layout, and user guides.

介绍了SP3实验板的系统结构和布局，用户指南。

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Analyzing the basic theory and development of PLL, and studying the design theory and impedance match problem of experimental circuit board.

分析了锁相环的基本原理和实现，并对射频电路设计理论和阻抗匹配问题进行了探究。

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Experimental Law Variations were devised and introduced by the International Rugby Board following consultation with coaches and players throughout world rugby.

BBC: Bates keen to test new rugby laws