POE adopts IEEE802.3af standard, and its output power consumption does not exceed ().

• A.30W
• B.15.4W
• C.50W
• D.71W

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Which of the following descriptions about the view gallery application platform is correct?

• A.During data retrieval, the platform supports online retrieval across multi-level visual galleries
• B.Since the upper and lower units of the visual library system are cascaded, the application platforms of different levels are exactly the same
• C.All of the above options are correct
• D.The video gallery application platform does not support user management

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What are the common installation methods of bolt and tube machine? (Multiple choice)

• A.Wall mount bracket + universal joint
• B.Embedded installation
• C.Hoop + universal joint
• D.Hoop + wall bracket + universal joint

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The distribution rate of a camera is 1080P, the code rate is 4Mbps, it needs to be stored for 30 days, and it needs storage space of ().

• A.1.85T
• B.0.75T
• C.2.15T
• D.1.25T

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Which of the following descriptions about the utility scheme is wrong?

• A.The battery has a life span, this factor needs to be considered in the planning stage
• B.If there is no power outage in a certain area, the site power supply plan needs to adopt the city power + lithium battery plan
• C.The lithium battery module guarantees the power supply of the site equipment in the event of a power failure
• D.Stations powered by city power do not need to be equipped with lithium battery modules at all sites

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