单项选择题

A.When at anchor，the pilot vessel is only required to s……

Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）

A.When at anchor，the pilot vessel is only required to sound anchor signals
B.The identification signal must be sounded any time the pilot vessel is underway
C.The pilot vessel may only sound the identity signal when making way
D.All of the above

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单项选择题Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.

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