An emergency sea anchor may be constructed by using（）.<br>A:a boat bucket<br>B:an air tank filled with water<br>C:an oar and canvas weighted down<br>D:All of the above

An emergency sea anchor may be constructed by using（）.
A:a boat bucket
B:an air tank filled with water
C:an oar and canvas weighted down
D:All of the above

出自：海船船员证

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