A.south celestial pole
B.north celestial pole
C.observer's meridian
D.Greenwich meridian
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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
A.equally sharing the load
B.jammed together
C.as far apart as possible
D.rove to the highest mechanical advantage
A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current
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A towing vessel’s fire detection system may be certified to comply with the Coast Guard’s towing vessel fire protection regulations by（）.
A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.
A time diagram is a diagram on the plane of the（）.
A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.
A tsunami is caused by a(n)（）.
A stand-on vessel is（）.
A vertex of the navigational triangle is NOT located at the（）.
A storm’s track is characterized by all of the following except（）.
A swift current occurring in a narrow passage connecting two large bodies of water，which is produced by the continuously changing difference in height of tide at the two ends of the passage，is called a（）.
A tug is best positioned for towing and maneuvering on rivers and other restricted waters where wave action is limited when（）.