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
单项选择题 Aphelion is the point where the Sun（）.
单项选择题 Any firefighting equipment that is carried in addition to the minimum required number on a ship must（）.
单项选择题 Any extinguishing agent used on a Class “C” fire must have which important property? （）
