[多项选择]属于车站停电时用的应急备品是（）。
A. 应急灯
B. 信号旗
C. 手电筒
D. 喇叭
E. 担架

{{B}} Friend or Foe Crows Never Forget a Face, It Seems{{/B}}
Crows and their relatives — among them ravens, magpies and jays — are renowned for their intelligence and for their ability to flourish in human-dominated landscapes. That ability may have to do with cross-species social skills. In the Seattle area, where rapid suburban growth has attracted a thriving crow population, researchers have found that the birds can recognize individual human faces.
John M. Marzluff, a wildlife biologist at the University of Washington, has studied crows and ravens for more than 20 years and has long wondered if the birds could identify individual researchers. Previously trapped birds seemed more wary of particular scientists, and often were harder to catch. "I thought, ’Well, it’s an annoyance, but it’s not really hampering our work,’ "Dr. Marzluff said, "But then I thought we should test it directly."
To test the birds’ rec