单项选择题
Horton Point Light（）.
A.is 14 feet above sea level
B.has a fixed green light
C.is shown from a white square tower
D.is synchronized with a radio beacon
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单项选择题
An immersion suit should be equipped with a/an（）.
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单项选择题
An immersion suit must be equipped with a(n)（）.
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