How many logbooks must a driver maintain?

驾驶员在同一时间应使用多少本驾驶日志？

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Keep previous logbooks for the required period. Do not divide work across several current logbooks to conceal hours in the same work period.

旧日志须继续按规定保存；不能分开使用多本当前日志来隐藏或拆分同一工作周期的工时。