Yes, 潮汐表-潮汐地震工具包&潮汐地震百科指南助手 is free to download, however it contains in-app purchases or subscription offerings.
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潮汐表-潮汐地震工具包&潮汐地震百科指南助手 has several in-app purchases/subscriptions, the average in-app price is €2.49.
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