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單項選擇題

Opposition occurs when（）.

A.the Sun，Earth，and Moon are at right angles
B.the Sun's declination is 0°and is moving south
C.an inferior planet is at the maximum angle to the line of sight to the Sun
D.the Earth is between a planet and the Sun

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單項選擇題

On mid-ocean waters，the height of a wind-generated wave is not affected by the（）.

A.water depth exceeding 100 feet
B.fetch
C.wind's velocity
D.duration of the wind

單項選擇題

Mars will not be visible（）.

A.at elongation angles near 180°
B.from quadrature to opposition
C.at conjunction
D.at opposition