单选题When a survival craft drill is held，the person in charge must insure that（）.Aall survival craft are lowered to the water，launched，and operated for thirty minutesBall davits used for launching liferafts are operatedCeach emergency position indicating radio beacon is tested for thirty minutesDthe helicopter pad landing lights are operating in a quick-flashing mode
单选题
When a survival craft drill is held，the person in charge must insure that（）.
A
all survival craft are lowered to the water，launched，and operated for thirty minutes
B
all davits used for launching liferafts are operated
C
each emergency position indicating radio beacon is tested for thirty minutes
D
the helicopter pad landing lights are operating in a quick-flashing mode
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