单项选择题
Green lights may appear on（）.
A.horizontally banded buoys
B.vertically striped buoys
C.yellow buoys
D.spherical buoys
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相关考题
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During loading or discharging，the tallymen must make contact with（）on duty so as to solve problems in time.
A.ship owner
B.ship’s officers
C.shippers
D.consignors -
单项选择题
Can you tell me something about the tallying methods at your port?（）.
A.Certain
B.Be certain
C.Sure
D.Be sure -
单项选择题
By day，the horizontal motion of a white flag，or arms extended horizontally，by a person on the beach indicates（）.
A.Haul away
B.Tail block is made fast
C.Negative
D.Affirmative
