单项选择题
How should you signal the crane operator to stop in an emergency?（）
A.Extend arm with the palm down and hold this position rigidly
B.Place clasped hands in front of your body
C.Extend arm and move hand rapidly right and left with the palm down
D.Place both fists in front of the body with the thumbs pointing outward
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相关考题
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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（）.
A.testing all alarm and detection systems
B.breaking out and using the vessel's emergency equipment
C.participation by selected crew members
D.one person putting on protective clothing，if the vessel is so equipped -
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（）.
A.one hour
B.two hours
C.ten hours
D.four hours -
单项选择题
During the towing of a survival craft，a lookout should be on station to（）.
A.release the towline in an emergency
B.help the helmsman steer
C.look for food and water
D.check the water level in the bilge
