单项选择题
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
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（）.
单项选择题 During the towing of a survival craft，a lookout should be on station to（）.