What is the goal of QoS in a network？（）A、prevent packets from being droppedB、increase available bandwidthC、reduce hardware errorsD、provide predictable network serviceE、eliminate propagation delayF、eliminate jitter and packet loss

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What is the goal of QoS in a network？（）

A、prevent packets from being dropped
B、increase available bandwidth
C、reduce hardware errors
D、provide predictable network service
E、eliminate propagation delay
F、eliminate jitter and packet loss

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30. He goes to bed at midnight.

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45.A【解析】句意：我真的想知道我弟弟怎么了。动词know后跟宾语从句。宾语从句要用陈述语序， B、C、D选项都不对，故选A．

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What is the go

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