A.Hardly ever looked into the causes of tragedies.B.Imposed safety rules as soon as accidents took place.C.Seldom introduced safety laws before disasters occurred.D.Paid much attention to the results of scientific discoveries.
A.Hardly ever looked into the causes of tragedies.
B.Imposed safety rules as soon as accidents took place.
C.Seldom introduced safety laws before disasters occurred.
D.Paid much attention to the results of scientific discoveries.