单项选择题
Apparent time is based on（）.
A.a fictitious sun moving along the celestial equator
B.the visible sun moving along the ecliptic
C.the Moon's motion in relation to the Sun
D.the movement of the first point of Aries
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Aphelion is the point where the Sun（）.
A.and Moon and Earth form a right angle
B.and Moon and Earth are in line
C.crosses the celestial equator
D.is farthest from the Earth -
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Any firefighting equipment that is carried in addition to the minimum required number on a ship must（）.
A.meet the applicable standards
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Any extinguishing agent used on a Class “C” fire must have which important property? （）
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