單項(xiàng)選擇題Antares is found in what constellation?()

A.Scorpio
B.Corvus
C.Libra
D.Corona Borealis


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1.單項(xiàng)選擇題An undocumented vessel with 10 people aboard and operating 25 miles off the seacoast must carry a survival craft of the().

A.inflatable buoyant apparatus type
B.buoyant apparatus type
C.life float type
D.Any of the above types are acceptable

2.單項(xiàng)選擇題An overtaking situation at night would be one in which one vessel sees which light(s) of a vessel ahead?()

A.Masthead lights and sidelights
B.One sidelight,the masthead lights and stern light
C.Both sidelights
D.Stern light

4.單項(xiàng)選擇題An isotherm is().

A.a line on a weather map connecting equal points of both temperature and pressure
B.an instrument that measures the climatological effects of temperature
C.a line connecting points of equal barometric pressure on a weather map
D.a line connecting points of equal temperature on a weather map

5.單項(xiàng)選擇題An intermediate spring is().

A.fitted in each leg of the towing bridle
B.generally located between the "fishplate" and the main towing hawser
C.secured at the "H" bitts
D.usually made of manila hawser