On a router that is configured with multiple IP SLA probes， which command can be used to manage the CPU load that was created by the periodic probing？（）
A. ip sla monitor low-memory
B. ip sla group schedule
C. ip sla reaction-trigger
D. ip sla enable timestam
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当事人提交上诉状（）。
A. 原则上应向原审人民法院提交
B. 原则上应向二审法院提交
C. 只能向原审法院提交.不能向原审法院提交
D. 只能向二审人民法院提交，不得向原审法院提交
鱼体的闭口病是由于血居吸虫引起的。
A. 正确
B. 错误
Which procedure(s) shall be used to determine risk of collision? （）
A. Watching the compass bearing of an approaching vessel
B. Systematic observation of objects detected by radar
C. Long-range radar scanning
D. All of the above
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