单项选择题
A.Trip the pump relief valve
B.Order the dock man to shut down
C.Call the owner，operator，or terminal supervisor
D.Run out the vessel's or terminal's fire hose
单项选择题 When fruit is carried as refrigerated cargo，the most frequent cause of its being infected at the discharge port is（）.
单项选择题 What additional precautions should be taken when making temporary repairs to a ship that is operating when hydrogen sulfide is present?（）
单项选择题 Ullages on tankers are measured from（）.