The area of Grade II,III,IV and worse than Grade IV is about 9.8 km,2,26000 km2,16000 km2 and 33000 km2 respectively.

 
  • 其中,二类、三类、四类和劣四类海水海域面积分别约为9.;8平方公里、2
今日热词
目录 附录 查词历史