A.a mechanical breakdown on the tug
B.adverse tidal current conditions
C.the tug reducing its speed
D.All of the above
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A.celestial meridian
B.celestial equator
C.celestial horizon
D.principal vertical circle
A.south celestial pole
B.north celestial pole
C.observer's meridian
D.Greenwich meridian
A.transmit the thrust of the engine to the propeller
B.transmit the thrust of the propeller to the vessel
C.absorb the shock of wave pressure at the bow
D.be placed between the engines and the foundation to absorb the vibration
A.altostratus
B.stratus
C.cumulus
D.cirrus
A.The moment of inertia would remain unchanged
B.The moment of inertia would be 1/4 its original value
C.The moment of inertia would be 1/2 the original value
D.None of the above
最新試題
A tow that is properly aligned to pass through a narrow opening between two bridge piers is “ （）”.
A tsunami is caused by a(n)（）.
A tug may be in danger of tripping when（）.
A survival craft being used to pick up a person who has fallen overboard from a ship should approach the person（）.
A towing light is（）.
A slow，gradual fall of the barometer indicates approaching（）.
A time diagram is a diagram on the plane of the（）.
A tug is “in irons” when held in a fixed position by（）
A vertex of the navigational triangle is NOT located at the（）.
A time diagram is a diagram of the celestial sphere as observed from above the（）.