单选题An emergence sea anchor may be constructed by type of extinguisher?（）.Aa boat bucketBan air tank filled with waterCan oar and canvas weighted downDAll of the above
单选题
An emergence sea anchor may be constructed by type of extinguisher?（）.
A
a boat bucket
B
an air tank filled with water
C
an oar and canvas weighted down
D
All of the above
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