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采样周期越小越好吗?为什么?

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烤制成熟方法其炉内热量是通过()的方式进行的。

A. 辐射
B. 传导
C. 对流
D. 全有

对于CRH2型车,200C型ATP断电后,LKJ可正常工作以确保安全。

A. 正确
B. 错误

使用光源和光功率计,通过计算可以得到被测光纤的长度。

A. 正确
B. 错误

Which four of these statements are restrictions for Frame Relay PVC bundles with QoS support for IP and MPLS? ()

A PVC bundle will not come up unless all the precedence, DSCP, and EXP levels are configured in thebundle.
B. A PVC bundle can perform precedence and DSCP matching at the same time
C. A PVC bundle may contain no more than sixteen PVCs
D. A PVC can be in only one PVC bundle
E. A PVC bundle cannot perform precedence and DSCP matching at the same time.
F. A PVC bundle may contain no more than eight PVCs.

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