问在kubernetes /apis/Evs.k8s.io/v1beta1端点中，CPU使用的可能单位是什么？

EN

{
  "kind": "PodMetricsList",
  "apiVersion": "metrics.k8s.io/v1beta1",
  "metadata": {
    "selfLink": "/apis/metrics.k8s.io/v1beta1/pods"
  },
  "items": [
    {
      "metadata": {
        "name": "name-of-the-container-667656d796-p586s",
        "namespace": "namespace-name",
        "selfLink": "/apis/metrics.k8s.io/v1beta1/pods/name-of-the-container-667656d796-p586s",
        "creationTimestamp": "2019-11-20T21:34:02Z"
      },
      "timestamp": "2019-11-20T21:33:02Z",
      "window": "30s",
      "containers": [
        {
          "name": "name-of-the-container",
          "usage": {
            "cpu": "350748682n",
            "memory": "238860Ki"
          }
        }
      ]
    }
  ]
}