1.By using digital millisecondmeter and phototube instead of manual operation,the improved trilinear pendulum experimental device improves measuring precision.
用数字毫秒计和
管取代手工操作，使改进后
三线摆实验仪提高了测量精度。
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phototube
n. 
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phototrophic bacteria, phototrophy, phototropic, phototropism, phototropy, phototube, phototvulcanization, phototype, phototypesetter, phototypesetting,
