单项选择题
A.the Sailing Directions and the Coast Pilot B.a weather fax C.the Local Notice to Mariners D.the Light List
Fusible-link fire dampers are operated by（）.A.a break-g...
单项选择题Fusible-link fire dampers are operated by（）.
A.a break-glass and pull-cable system B.electrical controls on the bridge C.a mechanical arm outside the vent duct D.the heat of a fire melting the link
From your position you observe a rotating white and gre...
单项选择题From your position you observe a rotating white and green light to the north. This light is most likely（）.
A.at an airport B.on a naval mine-countermeasures vessel C.Block Island North Light D.on a vessel engaged in public safety activity
From which type of cloud can a tornado or waterspout de...
单项选择题From which type of cloud can a tornado or waterspout develop?（）
A.Nimbostratus B.Altostratus C.Cumulonimbus D.Cirrus
