單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

It is difficult to determine which limb of the Moon is fully illuminated（）.

A.when the Moon is low in the sky at rising or setting
B.at the new Moon phase
C.when taking Moon sights during daylight
D.when the terminator is nearly vertical

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

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Mars will not be visible（）.

It is difficult to determine which limb of the Moon is fully illuminated（）.

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