When anchoring,it is a common rule of thumb to use a length of chain（）.<br>A:five to seven times the depth of water<br>B:seven to ten times the depth of water<br>C:twice the depth of water<br>D:twice the depth of water plus the range of tide

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

出自：海船船员证

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