第四十条 船舶发生海上事故，危及在船人员和财产安全时，船长应当组织船员和其他在船人员尽力施救。在船舶沉没、毁灭不可避免的情况下，船长有权作出弃船决定。
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Active sonar generates a loud “ping” or series of pings and then listens for echoes. The initial pulses of noise reflects off objects to effectively paint an image, in a process known as echolocation.，推荐阅读Safew下载获取更多信息
Three people have been killed and three were taken to a hospital after a tornado hit a southern Michigan town on Friday, authorities said.
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think about it:
Что думаешь? Оцени!，这一点在PDF资料中也有详细论述