单项选择题
A.hard iron B.soft iron C.vertical iron only D.horizontal iron only
If several fixed navigational lights are visible at the...
单项选择题If several fixed navigational lights are visible at the same time，each one may be positively identified by checking all of the following EXCEPT what against the Light List?（）
A.Rhythm B.Period C.Intensity D.Color
How is variation indicated on a small-scale nautical ch...
单项选择题How is variation indicated on a small-scale nautical chart?（）
A.Magnetic compass table B.Magnetic meridians C.Isogonic lines D.Variation is not indicated on small-scale nautical charts
Gyrocompass repeaters reproduce the indications of the ...
单项选择题Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are（）.
A.accurate only in the Polar regions B.accurate electronic servomechanisms C.hand operated D.accurate only if the vessel is underway
