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空调显示h4是系统异常的意思。 1、出现h4标识，有可能是空调 制冷剂 缺乏，可以打电话叫空调维保人员加制冷剂。 2、也有可能是空调内机的过滤网被堵塞，检查看看，如果有异物堵塞过.
H4 EAD Eligibility Criteria 2025 Who Qualifies for an H4 EAD
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