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
最新試題
A stretch where the channel changes from one side of the river to the other is called a （）.
A slow，gradual fall of the barometer indicates approaching（）.
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 tug is “in irons” when held in a fixed position by（）
A type of precipitation that occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level is known as（）.
A tow that is properly aligned to pass through a narrow opening between two bridge piers is “ （）”.
A squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged. It should be（）.
A towing hook may be released from the（）.
A tsunami is caused by a(n)（）.
A twin-screw vessel with a single rudder is making headway. The engines are full speed ahead. There is no wind or current. Which statement is FALSE? （）