How many meters to set the sound barrier
This is not to see how many Mha, is to look at the size of high-speed rail noise and the size of the harm caused to determine whether the sound barrier.
This is not to see how many Mha, is to look at the size of high-speed rail noise and the size of the harm caused to determine whether the sound barrier. This is determined by the environmental forecast report or the evaluation report, and even by the local public opinion and the relevant departments to decide.
This is determined by the environmental forecast report or the evaluation report, and even by the local public opinion and the relevant departments to decide.
