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单选题
All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.
A
every station in one chain to transmit at the same time
B
each station to transmit without reference to another station
C
on-line transmission of single-line transmitters at the same time
D
each station to only depend on the master for synchronization and signal ratio
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单选题The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.A
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Varied long and short pulses
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考题
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provide safety-related information automatically to shore stations，other vessels and aircraftB
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exchange safety-related information with shore-based facilitiesD
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考题
单选题The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.A
An atomic time standardB
Daylight Savings TimeC
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Greenwich Mean Time
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bailerB
spongeC
whistleD
fishing kit
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NAVTEXB
HYDROLANT/HYDROPACC
NAVAREAD
SAFESEA
考题
单选题All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.A
every station in one chain to transmit at the same timeB
each station to transmit without reference to another stationC
on-line transmission of single-line transmitters at the same timeD
each station to only depend on the master for synchronization and signal ratio
考题
单选题A “full service” Loran-C receiver will provide（）.A
matching pulse rates of at least 20 stationsB
an automatic on-and-off switchC
a horizontal matching of all delayed hyperbolic signalsD
automatic signal acquisition and cycle matching
考题
单选题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 usedB
in the Radio Aids to Navigation，PUB 117C
in the Loran-C Correction TablesD
Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading
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