题目内容：
往来港澳签注有几类？
参考答案：
问答题：往来港澳签注有几类？
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省级公安机关（）统一归口负责涉外案（事）件与外国驻华使馆、领馆的联系工作A．指挥中心B．出入境管理部门C．外国人管理工作领导小组办公室D．相关业务部门
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