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(2008•梅州)如图,要测量A、B两点间距离,在O点设桩,取OA中点C,OB中...
(2008•梅州)如图,要测量A、B两点间距离,在O点设桩,取OA中点C,OB中点D,测得CD=30m,则AB=
m.
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