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單項選擇題

A message by flashing light consists of the call，the identity，the text，and the （）.

A.destination
B.answer
C.time
D.ending

單項選擇題

A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）

A.The motion of the apparent sun is along the ecliptic
B.Measurement of time is along the celestial equator
C.The speed of the Earth's revolution is not constant
D.There are variations in the Earth's rotational speed

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A mobile offshore drilling unit must display obstruction lights when it is on the waters over the Outer Continental Shelf and is（）.

你可能感興趣的試題

A message by flashing light consists of the call，the identity，the text，and the （）.

A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）

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A message by flashing light consists of the call，the identity，the text，and the （）.