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【单选题】
四肢长管状骨摄片时至少应包括（）A.
邻近一个关节
B.
邻近两个关节
C.
不必包括关节
D.
不必摄侧位片
E.
对侧长骨
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举一反三
【单选题】You have been tasked with setting a trust boundary on the Company network. What is the basic function of this trust boundary？（）
A.
Trust boundaries are points in the network where Layer 2 CoS markings are converted to Layer 3 DSCP or IP precedence markings.
B.
Trust boundaries are a point in the network where QoS functionality begins and ends.
C.
Trust boundaries determine whether certain types of traffic can pass.
D.
Trust boundaries are a point in the network where decisions about CoS markings on incoming packets are made.
E.
None of the other alternatives apply
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