A swift current occurring in a narrow passage connecting two

A vessel engaged in ______ shall not impede the passage of any other vessel navigating within a narrow channel or fairway．

A.mine clearance operation

B.towing operation

C.dredging or surveying or underwater operation

D.fishing

A tow that is properly aligned to pass through a narrow opening between two bridge piers is " ______".

A.on course

B.headed fair

C.holding on

D.in shape

For a current liability to exist, the following two tests must be met. The liability must be due usually within a year and must be paid out of current assets.()

There are two areas off the N coast of France，which remain dangerous because of ______．

A.the density of vessel traffic on passage through the strait

B.the fact that the passage through the strait is constricted by a series of narrow banks，running NE-SW

C.mines lied in the war of 1939-1945

D.the strong tidal streams in the strait

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.hydraulic current

B.rectilinear current

C.rotary current

D.harmonic current

You are crossing a narrow channel in a 15-meter vessel when you sight a tanker off your port bow coming up the channel. Which statement is TRUE?

A.Yours is the give-way vessel because it is less than 30 meters long

B.You shall not impede the safe passage of the tanker

C.The tanker is the stand-on vessel because it is to port of your vessel

D.The tanker is the stand-on vessel because it is the larger of the two vessels

Vee-type engines have the connecting rods from two cylinders connected to each _____ of the crankshaft.

A.throw

B.web

C.main bearing

D.deflection

A ______ is created by a pressure gradient or slope in the water level．

A.gradient current

B.density current

C.swift current

D.torrent current