单项选择题
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
Aphelion is the point where the Sun（）.A.and Moon and Ea...
单项选择题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
Any firefighting equipment that is carried in addition ...
单项选择题Any firefighting equipment that is carried in addition to the minimum required number on a ship must（）.
A.meet the applicable standards B.be marked as additional equipment C.be stowed in a separate area D.All of the above
Any extinguishing agent used on a Class “C” fire must h...
单项选择题Any extinguishing agent used on a Class “C” fire must have which important property? （）
A.Cooling ability B.Leaves no residue C.Penetrating power D.Nonconductivity
