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
单项选择题 The basic collision avoidance display presented by CASII is designed for easy interpretation and（）of possible collision threat situations.
单项选择题 Radar makes the most accurate determination of the（）.
单项选择题 Radar is not only to obtain（），but also to measure their distance away from you.
