The "urgent" priority should be used for messages ______.
A.concerning the Safety of Life at Sea (SOLAS)
B.detailing important navigational warnings
C.containing information concerning the safety of a mobile unit or person
D.concerning on-scene communications
The preferred stockholders are deemed to have the priority ______.
A.to receive dividend payment
B.to elect board of directors
C.to vote on corporate policy
D.all of the above
Wben buying racehorses, people always give priority ______ good pedigrees.
A.in
B.for
C.at
D.to
A.noted
B.seen
C.watched
D.taken
有证标准物质是指()。
A.附有证书的参考物质
B.附有使用说明的参考物质
C.附有标签的参考物质
D.附有使用说明和标签的参考物质