单项选择题
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
单项选择题 Mars will not be visible（）.
单项选择题 It is difficult to determine which limb of the Moon is fully illuminated（）.
单项选择题 In working out a local apparent noon sight for your latitude，you subtract the Ho from 90°. The 90°represents the angular distance from（）.
