The room calld 微波暗室 or 全电波暗室 (anechoic chamber) ... usually such room for EMI/EMC test (Electro-Magnetic Interference). The jagged objects on the wall for absorbing ambient electromagnetic interference, inside the room it's a pure & clean electromagnetic environment to measure the...
China Navy 29th new Type054A FFG launch in ShangHai
Past 27x type054A FFGs launch time
PLAAF new J-16 fighter air-combat loading
PLAN Airforce Su30mk2 and J-10S fighters