7.阻力與航速2次方成正比變化,功率則約與航速的多少次方成正比?
(A)2
(B)2.5
(C)3
(D)3.5
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統計: A(0), B(0), C(2), D(0), E(0) #4006670
統計: A(0), B(0), C(2), D(0), E(0) #4006670