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?（）
A.Seal off all tank and compartment ventilation B.Remove all bulk materials from the P-tanks C.Provide respiratory protection and monitoring D.All of the above
单项选择题 Ullages on tankers are measured from（）.
单项选择题 Ullages are measured from（）.
单项选择题 Ullage measurements are taken from the top of the liquid to（）.
