A、essential
B、compulsory
C、optional
D、inadvisable
更多“It is（）for mariners to combine the SART with a float-free satellite EPIRB.”相关的问题
A、It provides a legal reason to cancel a projected voyage B、It allows the mariner to make long term weather forecasts C、It is of little benefit since the weather changes frequently and rapidly D、It gives the mariner time to prepare for weather changes
A、Doing it forl is 3 B、Doing it for l is 1 C、Doing it for l is 2 D、Doing it for l is 0 E、Doing it for l is？C1 F、Finish
A、It is the first time for me to anchor. B、It is the one time to me for anchor. C、It is for me the time to anchor. D、It is the one time for me to anchor.
A、it is used for load balancing in bidirectional PIM B、it is used for redundancy in bidirectional PIM C、it is used for redundancy in PIM-SM D、it is used for load balancing in PIM-SM
A、It is any alternative path for best effort traffic. B、It is the next hop of the active route to a directly attached device. C、It is the next hop for a route from a qualified protocol. D、It is an alternative next hop for a static route.
A、Ask for permission B、Record the time in your radio log C、Press the push to talk button three times D、Monitor the channel to insure that it is clear
A、A.it is usually cancelled B、B.its bill of lading not signed C、C.the shipper pays for it D、D.a remark is made for it
A、it is very noisy B、it is anonymous C、it is written as a commercial product for mass distribution D、it is an individual artistic creation
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