单项选择题
In a weather report,Z stands for（）.
A.zone time
B.zulu time
C.Greenich Mean Time
D.zone standard time
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In admiralty sailing directions, bands is the word used to indicate（）marking.
A.horizontal
B.vertical
C.diagonal
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In admiralty sailing directions, stripes is the word used to indicate（）marking.
A.horizontal
B.vertical
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D.vertical or diagonal -
单项选择题
In anchoring orders, up and down means（）.
A.the chain is not upright
B.the chain is tight
C.the chain is upright
D.the chain is slack
