测定油品PH时其试验用水如不煮沸（有二氧化碳存在），会使测定结果偏高。
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Which three characteristics of the traffic flow are taken into consideration when the QoS-for-VPNs feature （QoS pre-classify） provides packet classification and applies appropriate QoS service on tunnel interfaces？（）
A. IP precedence bits
B. DSCP bits
C. original port numbers
DE bits
E. source IP address
F. destination IP addre
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