This is a circuil plan of secondhand radiodetector truck lade weight with ultrasonic geodesic.Circuil structural is simple.
给出一种利波测距方间接测量载量的电路方案。
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However, the distances to the galaxies are not very well known because we can only measure them indirectly.
,星系的距离并是很清楚,因为能间接测量它。
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