单项选择题
A.stop the flow of oil at the main deck manifold
B.prevent the oil from leaving the shore facility
C.prevent the oil from siphoning through the pump
D.None of the above
单项选择题 How should you signal the crane operator to stop in an emergency?（）
单项选择题 Fire protection regulations for towing vessels require that drills be conducted on board the vessel as if there were an actual emergency. Drills include all of the following，EXCEPT（）.
单项选择题 Each emergency generator on a mobile offshore drilling unit，when tested，must be run under a full load for at least（）.