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Minimize drift of the instrument during prolonged operation.
在长期操作中，使仪表的误差减至最小。
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PRC drift car by traction locomotive traction into column operation.
PRC平巷人车由牵引机车牵引成列运行。
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PRC drift car by traction locomotive traction into column operation.
PRC平巷人车由牵引机车牵引成列运行。
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