A.more serious
B.not less serious
C.more dangerous
D.no more dangerous
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A.low water slack
B.high water slack
C.high water ebb
D.high water flood
A.lower low water
B.high water
C.low water
D.sea level
A.the height of the tide
B.depth of water under the bridge
C.charted vertical clearance at mean low water
D.distance from the water to low steel of the bridge
A.concealed
B.buried
C.existed
D.built
A.one nautical mile
B.two kilometers
C.5 cables only
D.one fathom
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At last，the palm trees that fringe the natural harbor of Port Aloahoa come into view on the horizon lit by the setting sun.The meaning of this sentence is that （）.
The distance between any two meridians measured along a parallel of latitude （）.
A vessel is entering port A for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do（）.
A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.
The Earth’s irregular heating is caused by （）.
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.
AFTER DROPPING THE PILOT means （）.
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
The meaning of ebb tide is that （）.
Clearance gauges at bridges indicate （）.