A.celestial meridian
B.celestial equator
C.celestial horizon
D.principal vertical circle
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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
A.equally sharing the load
B.jammed together
C.as far apart as possible
D.rove to the highest mechanical advantage
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A tackle is “two blocked” when the blocks are（）.
A vertex of the navigational triangle is NOT located at the（）.
A survival craft being used to pick up a person who has fallen overboard from a ship should approach the person（）.
A stage should only be rigged（）.
A tug is best positioned for towing and maneuvering on rivers and other restricted waters where wave action is limited when（）.
A towline should be fastened to（）.
A thrust block is designed to（）.
A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.
A special daymark is a（）.
A towing hook may be released from the（）.