单项选择题 During loading and discharging operations，in addition to when the cargo tanks have been properly filled，each inert gas system must be capable of maintaining a minimum gas pressure of（）.

单项选择题 After making the required notification that a large oil spill into the water has occurred，the FIRST action should be to（）.

单项选择题 According to the Chemical Data Guide，which reactive group(s) is/are not compatible with the products polybutene and o-xylene? （）