单项选择题

The heading of a vessel is indicated by what part of the compass? （）

A.Card
B.Needle
C.Lubber's line
D.Gimbals

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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.

A.full confirmation
B.precise appreciation
C.immediate assessment
D.timely recognition

单项选择题

Radar makes the most accurate determination of the（）.

A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target