A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current
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A.at a high rate of speed
B.under oars
C.against the wind
D.with the wind
A.the vessel has enough room to swing while at anchor
B.the anchor flukes bite into the ocean bottom
C.there is a sufficient scope of chain to keep the anchor on the bottom
D.there is more chain out than there is in the chain locker
A.Tehuantepecer
B.Papagayo
C.Norther
D.Pampero
A.bifurcation
B.transit
C.crossing
D.changeover
A.the direction the storm has come from
B.the direction in which the storm is moving
C.the speed at which the storm is moving
D.the path taken by the storm
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A tackle is “two blocked” when the blocks are（）.
A thrust block is designed to（）.
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 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 storm’s track is characterized by all of the following except（）.
A special daymark is a（）.
A stage should only be rigged（）.
A time diagram is a diagram on the plane of the（）.
A squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged. It should be（）.
A slow，gradual fall of the barometer indicates approaching（）.