1 Subjects: “...energy efficiency...”

2 Subjects: “...Combustion efficiency...”

3 Subjects: “...Froude propulsion efficiency...”

4 Subjects: “...efficiency...”

5 Subjects: “...energy-efficient...”

6 Subjects: “...computational efficiency...”

7 Subjects: “...sediment flushing efficiency...”

8 Subjects: “...agricultural ecological efficiency...”

9 Subjects: “...super-efficient SBM...”

10 Subjects: “...charge separation efficiency...”

11 Subjects: “...eco-efficiency...”

12 Subjects: “...firm efficiency...”

13 Subjects: “...efficiency...”

14 Subjects: “...efficiency...”

15 Subjects: “...efficiency...”

16 Subjects: “...high efficiency...”

17 Subjects: “...high efficiency...”

18 Subjects: “...high efficiency...”