单项选择题
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
A.on loran charts covering areas where sky waves are used
B.in the Radio Aids to Navigation，PUB 117
C.in the Loran-C Correction Tables
D.Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading
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