flood prevention in flood season
storage and transportation in the oil field
Workers in the oil field
Drought and flood in flood season
flood in the south and drought in the north
Flood in the summer 1998
Geological hazards in the flood season
impounding time in the flood recession
in the flood recession period
trust in flood prevention projects
aids in the prevention of cavities
help in the prevention of chronic diseases
Lightning prevention in the rural areas
policy of prevention in the first place and integrating prevention with control
Acquisition and manipulation of data in the field
air motion flow field in the air duct of a rotor
Ansai oil field in Changqing
application of maize stalk in the field