《铁路旅客人身伤害及携带品损失处理暂行办法》对下列情形造成的旅客人身伤害应当立即向铁路公安机关报警：因散布谣言、谎报险情、疫情、警情、扬言放火、爆炸、投放危险物质、或者非法阻拦行车、堵塞隧道等，引起公共秩序混乱。
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When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined?（）
A. It is supplied by the CSU/DS
B. It is supplied by the far end router.
C. It is determined by the clock rate command.
D. It is supplied by the Layer 1 bit stream timing.
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