A.spider element
B.sensitive element
C.link arm
D.pickup transformer
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A.high or low
B.AC or DC
C.strong or weak
D.on or off
A.gyro-compass
B.marine radar
C.DF
D.navigational satellite
A.two stations，including one on the nearest coast
B.two stations，including one on the nearer coast
C.three stations，including one on the farthest coast
D.three stations，including one on the nearest coast
A.parallel bearings
B.long-range bearings
C.short-range bearings
D.cross bearings
A.their transmitters
B.their receivers
C.their radars
D.their lorans
最新試題
Radar makes the most accurate determination of the（）.
The heading of a vessel is indicated by what part of the compass? （）
To obtain accuracy in fixing by DF，（）and three stations should be used.
The（）transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
Which statement concerning GPS is TRUE（）.
Automatic identification systems（AIS）are required to（）.
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
Loran-C is which type of system（）.
Loran-C uses the multiple pulse system because（）.