During loading or discharging，the tallymen must make contact with（）on duty so as to solve problems in time.

Can you tell me something about the tallying methods at your port?（）.

A.Certain
B.Be certain
C.Sure
D.Be sure

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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

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