单项选择题
An azimuth angle for a body is measured from the（）.
A.observer's meridian
B.Greenwich meridian
C.body's meridian
D.zenith distance
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相关考题
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An authorized light to assist in the identification of submarines operating on the surface is a(n)（）.
A.blue rotating light
B.intermittent flashing amber/yellow light
C.flashing white light
D.flashing sidelight -
单项选择题
An aneroid barometer on a boat should always be（）.
A.located in an air-conditioned area
B.mounted in the passenger compartment
C.protected by a collision bulkhead
D.permanently mounted -
单项选择题
An anchored vessel is servicing an aid to navigation and is restricted in her ability to maneuver. Which lights will she show? （）
A.Three lights in a vertical line，the highest and lowest red and the middle white，and anchor lights
B.Three lights in a vertical line，the highest and lowest red and the middle white，ONLY
C.Anchor lights ONLY
D.Anchor lights and sidelights ONLY
