What is the best guide for determining the proper scope of anchor chain to use for anchoring in normal conditions（）.<br>A:One shot of chain for every ten feet of water<br>B:One shot of chain for every fifteen feet of water<br>C:One shot of chain for every thirty feet of water<br>D:One shot of chain for every ninety feet of water

What is the best guide for determining the proper scope of anchor chain to use for anchoring in normal conditions（）.
A:One shot of chain for every ten feet of water
B:One shot of chain for every fifteen feet of water
C:One shot of chain for every thirty feet of water
D:One shot of chain for every ninety feet of water

出自：海船船员证

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