... 定宽凸轮 constant breadth cam 定径凸轮 constant diameter cam 等速曲线（球面） constant speed curve ...
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constant deviation spectroscope ==> 恒偏分光镜,直视棱镜分光镜 constant diameter cam ==> 等径凸轮 constant difference pressure-reducing valve ==> 定差减压阀 ..
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