单项选择题
A.port and starboard strings B.outer strings C.drag strings D.side strings
A tow can override its tug as a result of（）.A.a mechani...
单项选择题A tow can override its tug as a result of（）.
A.a mechanical breakdown on the tug B.adverse tidal current conditions C.the tug reducing its speed D.All of the above
A time diagram is a diagram on the plane of the（）.A.cel...
单项选择题A time diagram is a diagram on the plane of the（）.
A.celestial meridian B.celestial equator C.celestial horizon D.principal vertical circle
A time diagram is a diagram of the celestial sphere as ...
单项选择题A time diagram is a diagram of the celestial sphere as observed from above the（）.
A.south celestial pole B.north celestial pole C.observer's meridian D.Greenwich meridian
