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单选题
Which statement about satellite navigation is TRUE? （）
A
While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracy
B
The satellites are in equatorial orbits around the earth about 60°of longitude apart
C
The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite
D
The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking
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更多 “单选题Which statement about satellite navigation is TRUE? （）A While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracyB The satellites are in equatorial orbits around the earth about 60°of longitude apartC The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satelliteD The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking” 相关考题
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单选题Which statement about satellite navigation is TRUE? （）A
While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracyB
The satellites are in equatorial orbits around the earth about 60°of longitude apartC
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单选题Which statement is true about terms in a policy?（）A
A single term can be applied to a protocol or interface, independent of the policy.B
Once configured, terms within a policy cannot be reordered.C
The name of a term is limited to five characters.D
A from statement is optional in a term.
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