单项选择题

Mariners are warned that fog signals should（）be relied upon implicity.

A.always
B.never
C.sonetimes
D.sometime

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单项选择题
Molded depth is measured from the（）.

A.inside of the shell
B.outside of the shell
C.top of the center vertical keel
D.top of the garboard stake
单项选择题
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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