While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracy
The satellites are in equatorial orbits around the earth about 60°of longitude apart
The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite
The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking
第1题：
A. They must be fully meshed
B. They can be in a different AS
C . They do not need to be directly connected
D. They must be directly connected
第2题：
Which statement about stowing spare hose is TRUE ________．
A.Fold the hose so that the male coupling is about 4 feet from the female coupling，then roll it up
B.Roll the hose starting at the female end
C.Roll the hose starting at the male end
D.Fold the hose into lengths about 6 feet long and then lash the folds together
第3题：
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.
第4题：
Which statement is true about IBGP routers? （）
第5题：
Which statement is true about terms in a policy?（）
第6题：
Which statement about radio navigational warnings is TRUE ________．
A.The topics for warnings included in HYDROLANTS，HYDROPACS，and NAVAREA warnings are the same
B.NAVAREA warnings concern only coastal navigation and inland navigation in large bays or sounds such as Puget Sound
C.The United States is responsible for NAVAREA warnings in the North Atlantic north of 7°N，and west of 15°W
D.Long range radio navigational warnings are usually broadcast by radiotelephone，radiotelegraph，and radio-teletypewriter
第7题：
Which statement is true about terms in a policy?（）
第8题：
A.A
B.B
C.C
D.D
第9题：
Which three statements are true about terms in a policy?（）
第10题：
Which two statements are true about terms in a routing policy?（）