中国铁路上海局集团有限公司关于印发《中国铁路上海局集团有限公司旅客投诉处理实施细则》的通知（上铁客〔2018〕179号)中规定：对旅客来信来访或上级转来的投诉问题，由相关单位只能部门根据投诉问题的具体情况，采取直接调查处理。

(The third question): "中国铁路上海局集团有限公司关于印发《中国铁路上海局集团有限公司旅客投诉处理实施细则》的通知（上铁客〔2018〕179号)中规定：对旅客来信来访或上级转来的投诉问题，由相关单位只能部门根据投诉问题的具体情况，采取直接调查处理。 A.正确 B.错误 答案:B" (Translation: "The notice issued by China Railway Shanghai Group Co., Ltd. on the implementation of the 'Implementation Rules for Handling Passenger Complaints of China Railway Shanghai Group Co., Ltd.' (Shang Tie Ke [2018] No. 179) stipulates that complaints from passengers' letters, visits, or forwarded by superiors can only be directly investigated and handled by the relevant departments based on the specific situation of the complaint. A. True B. False Answer: B") Answer Analysis: The answer is "B.错误 (False)." The question states that complaints from passengers' letters, visits, or forwarded by superiors can only be directly investigated and handled by the relevant departments based on the specific situation of the complaint. However, the correct answer is false because the given statement is incorrect. According to the notice mentioned in the question, complaints from passengers' letters, visits, or forwarded by superiors should be directly investigated and handled by the relevant departments, not "only" by them.