单选题When anchoring,it is a common rule of thumb to use a length of chain（）.Afive to seven times the depth of waterBseven to ten times the depth of waterCtwice the depth of waterDtwice the depth of water plus the range of tide
单选题
When anchoring,it is a common rule of thumb to use a length of chain（）.
A
five to seven times the depth of water
B
seven to ten times the depth of water
C
twice the depth of water
D
twice the depth of water plus the range of tide
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