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1．报送时机：船舶进入上述区域前开始报送，船舶离开上述后取消报送。
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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
Atmospheric machine-gun has fired storm after deadly storm at the region this year, leaving a trail of widespread destruction
Connecting temporary events, such as a golf tournament or a music festival, is challenging, says Simon Wilson, chief technology solutions leader at HPE Aruba Networking.