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(2007•南平)如图,甲顺着大半圆从A地到B地,乙顺着两个小半圆从A地到B地,...
(2007•南平)如图,甲顺着大半圆从A地到B地,乙顺着两个小半圆从A地到B地,设甲、乙走过的路程分别为a、b,则( )
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A.a=b
B.a<b
C.a>b
D.不能确定
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