... 有孔粒料，轻粒料 Vermiculite，exfoliated 经纬仪上盘 Vernier circle 折回复读游标 Vernier，doublefolded ...
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vernier circle west bank 经纬仪上盘
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Both the graduated circle and vernier are equipped with fine adjusting screws and locking device so as to achieve fine adjustment.
刻度和游标都装有微动调整和锁紧装置，进行精细调节。
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