单选题 Between April and November, squalls ( ) as Sumateras 苏门答腊风飑 ( ) in Malacca Strait in The late afternoon or overnight and ( ) E to affect the W coast of Malaysia and Singapore Island.
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单选题 Where can a mariner find the variation of a given locality?
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单选题 Which is not included in compass bowl?
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单选题 Which of the following is the main cause of ship’s variation?