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我国的工业纯铜有T1,T2,T3,T4,其中T4比T1的纯度()
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A.(1) (> x 0 t1) (2) (if t1 _ 6) (3) (/ b 2 t2) (4) (- a t2 t3) (5) (* t3 c t4) (6) (= t4 _ x) (7) (ie _ _ _)
B.(1) (> x 0 t1) (2) (if t1 _ 7) (3) (- a b t2) (4) (/ t2 2 t3) (5) (* t3 c t4) (6) (= t4 _ x) (7) (ie _ _ _)
C.(1) (> x 0 t1) (2) (if t1 _ 7) (3) (/ b 2 t2) (4) (- a t2 t3) (5) (* t3 c t4) (6) (= t4 _ x) (7) (ie _ _ _)
D.(1) (> x 0 t1) (2) (if t1 _ 7) (3) (/ b 2 t2) (4) (- a t2 t3) (5) (* t3 c t4) (6) (= x _ t4) (7) (ie _ _ _)
A manufacturing company has four types of cost (identified as T1, T2 , T3 and T4). The total cost for each type at two different production levels is: Cost type Total cost for 125 units Total cost for 180 units $ $ T1 1,000 1,260 T2 1,750 2,520 T3 2,475 2,826 T4 3,225 4,644 Which two cost types would be classified as being semi-variable?
A、T1 and T3
B、T1 and T4
C、T2 and T3
D、T2 and T4
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