6、針對理想的 Rankine Cycle(如圖 6)而言，下列敘述何者正確? (A)2-3 為等容過程 (B)3-4 是等壓過程 (C)渦輪作正功 (D)幫浦作正功。

10、 In Figure 10, a horizontal force of 500 N acts on a block of weight 1.5 kN placed on an inclined plane. The coefficients of friction between the block and the plane are μs =0.25 andμk = 0.20 . What is the actual frictional force? (A) 200N (B) 500 N (C) 300 N (D) 450 N。