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 strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.
A spanner is a （）.
A towing vessel’s fire detection system may be certified to comply with the Coast Guard’s towing vessel fire protection regulations by（）.
A towline should be fastened to（）.
A time diagram is a diagram of the celestial sphere as observed from above the（）.
A tug in irons is（）.
A stand-on vessel is（）.
A tow of 9 barges is made up three abreast by three long. The towboat is faced up to the last barge of the center string. The outer two strings of barges are the（）.
A storm’s track is characterized by all of the following except（）.
A slow rise in the barometric pressure forecasts（）.