Anemergencyseaanchormaybeconstructedbyusing______A

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

正确答案：D
应急海锚能够通过使用船用桶灌水的空气罐加重下沉的浆橹或帆布