In the design of the hot water supply system, which of the following measures should be taken to ensure that the rooms in a superior hotel can get domestic hot water not lower than 45℃? ( )

Item A is the layout principle that the central hot water supply system must abide by, not the "measure" of this topic.

BC 2. According to Article 6.3. 13 of Design Standard for Water Supply and Drainage in Buildings, when the system layout cannot meet the requirements of Article 6.3. 10, the following measures should be taken; The branch pipe shall be equipped with self-adjusting electric heat tracing insulation; Branch pipes without domestic water meters shall be equipped with branch pipe circulation system.

In item D, setting a thermostatic mixing valve is a measure to prevent scalding.