The plastics themselves are extremely energy-rich – they have a higher calorific (8)______ than coal and one (9)______ of ‘recovery’ strongly favored by the plastic manufacturers is the (10)
The plastics themselves are extremely energy-rich – they have a higher calorific (8)______ than coal and one (9)______ of ‘recovery’ strongly favored by the plastic manufacturers is the (10)______ of waste plastic into a fuel.
A. measure
B. mechanism
C. method
D. medium