24. The stroke-to-bore ratio of a low speed engine is 3:1. When the stroke is 900 mm, the diameter of bore is ____ .
(A) 2,700 mm
(B) 300 mm
(C) 3,600 mm
(D)225 mm

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統計： A(15), B(55), C(4), D(0), E(0) #1265641