單項選擇題Mariners are warned that fog signals should（）be relied upon implicity.
A.always
B.never
C.sonetimes
D.sometime
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A.inside of the shell
B.outside of the shell
C.top of the center vertical keel
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2.單項選擇題Mooring（）are placed on both banks of the Suez Canal about 200m apart.
A.bollards
B.ballasts
C.bands
D.benefits
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The company should establish and maintain procedures to control all documents and date which are relevant to（）.
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