单项选择题

The loran lines drawn on navigation charts represent（）.

A.Ground waves
B.Skywaves
C.Either ground waves or skywaves interchangeably
D.An average between ground wave and skywave positions

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单项选择题
The line connecting the Loran-C master station with a secondary station is called the（）.

A.Focus line
B.Base line
C.Side line
D.Center line
单项选择题
The information received by AIS will be displayed on（）.

A.DCU
B.UTC
C.ENC
D.MENU
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