光敏三极管与发光二极管沿径向安装于端盖上形成测量头。
The phototransistor and the light emitting diode are arranged on the end cover along a radical direction to form a measurement head.
光敏三极管与发光二极管沿径向安装于端盖上形成测量头。
The phototransistor and the light emitting diode are arranged on the end cover along a radical direction to form a measurement head.
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