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When testing the Bluetooth Low Energy feature of HarmonyOS, a developer needs to make the...

When testing the Bluetooth Low Energy feature of HarmonyOS, a developer needs to make the central device perform Bluetooth scanning. Which of the following descriptions of the developer's actions are correct?

A.

Get scan filter, if the filter isempty, it is not used to scan without filter

B.

calls startScan() to start scanning the Bluetooth device

C.

Before performing Bluetooth scanning, it is necessary to inherit the advertiseCallback class to implement startResultEvent

Callback, which is used to receive scan results

D.

Call the BleCentralManager(BleCentralManagerCal1lback callback)API to obtain the device management object

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