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【单项选择题】

A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has（）.

A、A.error of perpendicularity

B、B.side error

C、C.prismatic error

D、D.centering error

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更多“A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has（）.”相关的问题
第1题
[单选题] （）is the navigational timekeeper of the vessel.

A、The marine sextant  B、The chronometer  C、The magnetic compass  D、The gyrocompass  

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第2题
[] （）is used for measuring horizontal and vertical angles.

A、A.The marine sextant  B、B.Thechronometer  C、C.The magnetic compass  D、D.The gyrocompass  

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第3题
[单选题] A gas-free certificate would usually be issued by a (n)（）.

A、CCS marine surveyor  B、certified marine chemist  C、port engineer  D、HAS marine inspector  

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第4题
[单选题] （）sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.

A、The marine sextant  B、The chronometer  C、The echo sounder  D、The radar  

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第5题
[单选题] （）sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.

A、The marine sextant  B、The chronometer  C、The echo sounder  D、The radar  

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第6题
[] （）is an equipment used to detect the presence of ships ,buoys,coast and many other targels and to obtain range and bearing of these targets.

A、A.The marine sextant  B、B.The chronometer  C、C.The echo sounder  D、D.The radar  

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第7题
[单选题] A sextant having an index error that is off the arc has a（）.

A、positive correction  B、dip error  C、negative correction  D、semidiameter error  

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第8题
[单选题] A sextant having an index error that is off the arc has a（）.

A、positive correction  B、dip error  C、negative correction  D、semidiameter error  

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第9题
[单选题] The Great Barrier Reef is included on the World Heritage list because（）

A、it has the most beautiful seascape in the world  B、it has the greatest number of islands in the world  C、it has the most diverse and complex marine life in the world  D、it has the longest coast in the world  

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