For WLAN survey outdoor bridge scene, which of the following content is need to pay attention to? (Multiple Choice)

For WLAN survey outdoor bridge scene, which of the following content is need to pay attention to? (Multiple Choice)
A . Whether the transmission path of the bridge link is blocked, mark the latitude and longitude of the station
B . For the site to observe the AP and antenna installation
C . Each site needs to be concerned about the location of the weak current room
D . Whether to add a relay between the leaf site and the aggregation site or not

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Answer: ABD