單項選擇題
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
A.speed of the current at a particular time B.maximum speed of the current C.direction from which the current flows D.direction in which the current flows
A.period B.range C.distance D.depth
A.Moon being at its maximum declination B.Moon crossing the equator C.Sun and Moon both being near 0°declination D.Moon being at perigee
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
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