单项选择题

A wave entering（）is likely to produce bores．

A.shallow water
B.deep water
C.river
D.tide

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单项选择题

A.SEMIDIURNAL
B.DIURNAL
C.MIXED
D.OSCILLATING

单项选择题

A.slack water when upbound
B.shallow water
C.a cross current
D.a head current

单项选择题

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