潮汐（tide）

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• Tide is（）in direction ENE.

  A . getting B . setting C . being D . having

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• The datum from which the predicted heights of tides are reckoned in the tide tables is（）.

  A . mean low water B . the same as that used for the charts of the locality C . the highest possible level D . given in table three of the tide table

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• Neap tides occur（）.

  A . At the start of spring，when the Sun is nearly over the equator B . Only when the Sun and Moon are on the same sides of the Earth and are nearly in line C . When the Sun and Moon are at approximately 90° to each other，as seen from the Earth D . When the Sun，Moon，and Earth are nearly in line，regardless of alignment order

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• I expect to（）when tide rises.

  A . aground B . refoat C . stranded D . hit the rock

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• From（）the mariner can understand the data of tide.

  A . cargo plan B . tide table C . port list D . sea litlot

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• Priming of the tides occurs（）.

  A . at times of new and full Moon B . when the Earth，Moon，and Sun are lying approximately on the same line C . when the Moon is between first quarter and full and between third quarter and new D . when the Moon is between new and first quarter and between full and third quarter

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• The tide is（）.

  A . black B . setting C . being D . having

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• From （）the mariner can understand the data of tide．

  A . cargo plan B . tide table C . port list D . sea pilot

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• Spring tides occur（）.

  A . at the start of spring，when the Sun is nearly over the equator B . only when the Sun and Moon are on the same side of the Earth and nearly in line C . when the Sun and Moon are at approximately 90°to each other as seen from the Earth D . when the Sun，Moon，and Earth are nearly in line，in any order

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• What is the tide（）.

  A . do B . to do C . doing D . to doing

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• 潮汐周日不等（diurnal inequality of tide）的现象为（）。

  A . A．一天有两次涨潮和两次落潮 B . B．相邻两次高潮或两次低潮潮高不等 C . C．涨落潮时间不相等 D . D．一天有两次高潮或两次低潮的潮高以及相邻的高、低潮的时间间隔不相等

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• Tide in this water area is（）in direction ENE.

  A . getting B . setting C . being D . having

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• Neap tides occur when the（）.

  A . Moon is in its first quarter and third quarter phases B . Sun and Moon are on opposite sides of the Earth C . Moon's declination is maximum and opposite to that of the Sun D . Sun and Moon are in conjunctio

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• When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.

  A . Diurna B . Semi-diurnal C . Solar D . Mixed

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• Which statement is TRUE concerning equatorial tides（）.

  A . They occur when the Sun is at minimum declination north or south B . They occur when the Moon is at maximum declination north or south C . The difference in height between consecutive high or low tides is at a minimum D . They are used as the basis for the vulgar establishment of the port

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• Which statement is TRUE concerning apogean tides（）．

  A . They occur only at quadrature B . They occur when the Moon is nearest the Earth C . They cause diurnal tides to become mixed D . They have a decreased range from normal

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• 127. Neap tides occur _______ .

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• 124. A tide is called diurnal when ______ .

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• 262. The meaning of ebb tide is that ______.

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• 207. Spring tides occur

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• 187.When there are small differences between the heights of two successive high tides or two successive tides, the tides are called _____.

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• 96. The datum from which the predicted heights of tides are reckoned in the tide tables is _____.

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• 11. To predict the actual depth of water using the Tide Tables，the number obtained from the Tide Tables is _____.

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• The two tides in a given day______.

  A．never vary in extent B．may vary in extent C．only vary in extent at the time of a new moon or a full moon D．always vary in extent

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