The plastics themselves are extremely energy-rich – they have a higher calorific (12)_____ than coal and one (13)_____ of ‘recovery’ strongly (14)_____ by the plastic manufacturers is the
The plastics themselves are extremely energy-rich – they have a higher calorific (12)_____ than coal and one (13)_____ of ‘recovery’ strongly (14)_____ by the plastic manufacturers is the (15)_____ of waste plastic into a fuel.
A. degree
B. value
C. demand
D. effect