单项选择题
According to the customs of this port，the work of opening and closing hatch covers is done by （）.
A.the ship's officers B.the foreman from the shore C.the ship's hands D.the tally man
单项选择题 A vessel’s Derat Certificate is always issued by （）.
单项选择题 A vessel operating in class has met all the requirements of the （）.
单项选择题 A Permit to Proceed is issued by the （）.
