This example USES a predefined "ping" Nagios plug-in, which sends Internet Control Message Protocol (ICMP) echo requests to determine if a host is responsive or not.
这个示例使用了一个预定义的“ping”Nagios插件，它将发送Internet控制信息协议(Internet Control Message Protocol,ICMP)回显请求以确定主机是否有响应。
So, it requests radar provided with the ability to restrain clutter wave for differentiating the echo of moving target.
因此要求雷达必须具备很强的抑制杂波的能力，能在较强的杂波背景中分辨出运动目标的回波。
So, it requests radar provided with the ability to restrain clutter wave for differentiating the echo of moving target.
因此要求雷达必须具备很强的抑制杂波的能力，能在较强的杂波背景中分辨出运动目标的回波。
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