巡回检查时不仅要查设备，也要查安全设施是否完整齐全。（）
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Which of the following is most accurate in describing the required types of FCP zoningconsiderations when implementing a SAN Volume Controller （SVC）？（）
A. zoning is typically limited to controlling access to physical storage
B. zoning is focused on access control between SVC nodes and host systems
C. zoning is focused on access to physical storage arrays， SVC clusters， and hosts
D. zoning is focused on the access relationship between SVC nodes and the physical storagearray
我国变压器的额定频率为50Hz。
A. 正确
B. 错误
以下部件位于摄像机镜头内的是（）。
A. 取景器
B. 变焦钮
C. 光圈环
D. 以上皆有
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