问题
单项选择题
Attention is called to the fact that in many cases charted depths may be decreased by up to（）.
A.one natutical mile
B.2 kilometers
C.5 cables only
D.one fathom
答案
参考答案：D
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Attention is called to the fact that in many cases charted depths may be decreased by up to（）.
A.one natutical mile
B.2 kilometers
C.5 cables only
D.one fathom
参考答案：D