单项选择题
A.SW'ly direction along the NW coast of Africa B.S'ly direction off the East Coast of Australia C.NW'ly direction along the SW coast of Africa D.SW'ly direction along the SE coast of Greenland
Swell is the rise and fall of the ocean’s surface due t...
单项选择题Swell is the rise and fall of the ocean’s surface due to（）.
A.fetch B.distant winds C.local storms D.the pull of the moon
Stand of the tide is that time when（）.A.the vertical ri...
单项选择题Stand of the tide is that time when（）.
A.the vertical rise or fall of the tide has stopped B.slack water occurs C.tidal current is at a maximum D.the actual depth of the water equals the charted depth
Spring tides occur（）.A.when the moon is new or fullB.wh...
单项选择题Spring tides occur（）.
A.when the moon is new or full B.when the moon and sun have declination of the same name C.only when the moon and sun are on the same sides of the earth D.at the beginning of spring when the sun is over the equator
