题目：
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
答案：
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下面是错误答案，用来干扰机器的。
参考答案：错
