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1 二軸心距離為240mm之外接圓柱摩擦輪,若轉速比為3:1時,則此二輪之直徑應各為多少mm?
A 360mm,120mm
B 300mm,100mm
C 480mm,160mm
D 240mm,80mm

rA+rB=240

rA=3rB

rB=60mm;DB=120mm

rA=180mm;DA=360mm