It describes the manufacture of a system for people aerial defence alertcontrol based on people aerial defence alerts multi-working modes.
介绍了基于人防警报系统多种工作模式的情况下警报控制系统的研制。
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Birds that are literally half asleep—with one brain hemisphere alert and the other sleeping—control which side of the brain remains awake, according to a new study of sleeping ducks.
This photo story documents the combined efforts of WHO and its partners in the Global outbreak Alert and Response Network to monitor, investigate and control the outbreak of Marburg fever in Uganda.