A smooth，tapered pin，usually of wood，used to open up the strands of a rope for splicing is called a(n)（）.
A. batten
B. bench hook
C. awl
D. fid
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管道跨越铁路和道路时，管道跨越电气化铁路时，轨面以上的净空高度不应小于（）m。
A. 4.5
B. 5
C. 5.5
D. 6.6
.马克思说，人的本质并不是单个人所固有的抽象物。在其现实性上，它是（）的总和。
What are three considerations when choosing the QoS model to deploy in a network？（）
A. the routing protocols being utilized in the network
B. the applications utilizing the network
C. the traffic destinations
D. network addressing scheme
E. cost of implementation
F. the amount of the control needed of the resource
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