High-velocity fog（）.

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• FOG[W]表示能见度为（）。

  A . A．0.5～5nmile B . B．小于0.5nmile C . C．小于2nmile D . D．2～5nmile

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• The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to（）.

  A . a difference in water pressure B . the method of breaking up the water stream C . the length of the applicator D . All of the above

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• Radiation fog is more commonly encountered in（）.

  A . spring B . later winter C . autumn D . end of summer

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• Fog forms when the air（）.

  A . Is 50% water saturated B . Is 90% water saturated C . Temperature is greater than the dew point temperature D . Temperature is equal to，or below the dew point temperature

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• The 12-foot low-velocity fog applicator（）.

  A . has a spray pattern 12 feet in diameter B . can be used in conjunction with both 1-1/2 inch and 2-1/2 inch all-purpose nozzles C . has a 90°bend at its discharge end D . has a screw thread end which connects to the all-purpose nozzle

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• The fog most commonly encountered at sea is called（）.

  A . conduction fog B . radiation fog C . frontal fog D . advection fog

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• Advection fog holds longest over which portions of the lakes? （）

  A . Northwest B . Southeast C . Northeast D . Southwest

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• Which instrument is most useful in forecasting fog（）.

  A . A barometer B . An anemometer C . A sling psychrometer D . A pyrometer

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• Advection fog may be formed by cold air passing over a（）.

  A . colder sea surface B . warmer sea surface C . dry coastal plains D . high mountain or plateau

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• When navigating in thick fog with the radar on，you should（）.

  A . station the look-out in the wheelhouse to keep a continuous watch on the radar B . secure the sounding of fog signals until a vessel closes within five miles C . station a look-out as low down and far forward as possible D . keep the radar on the shortest available range for early detection of approaching vessel

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• 怎么看到fog函数的模型树？

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• The fog is lifted，so（）the radar．

  A . close B . open C . switch off D . switch o

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• Fog is most commonly associated with a(n)（）.

  A . warm front at night B . low pressure area C . anticyclone D . lack of frontal activity

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• The fog is too thick. Don’t（）the radar.

  A . switch on B . switch off C . close D . ope

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• Mariners are warned that fog signals should（）be relied upon implicity.

  A . always B . never C . sonetimes D . sometime

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• Radar makes it possible for us（）in dense fog.

  A . to be sailing B . sailing C . sail D . to sail

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• 在地面分析图中FOG[W]的含义是（）。

  A . A．大风警报 B . B．一般警报 C . C．浓雾警报 D . D．风暴警报

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• You are running（）danger.Fog bank ahead of you.

  A . to B . at C . in D . into

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• 地面图上FOG[W]表示海面能见度（）。

  A . A．＜0.1km B . B．＜1km C . C．＞1km，＜10km D . D．＜10km

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• Advection fog is most commonly caused by ______.

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• 17日图12中东海出现FOG[W]天气表明________。

  A．东海处于冷锋后 B．东海处于冷锋前的暖区 C．东海处于冷锋前的冷区 D．东海处于暖锋前

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• *地面图上FOG[W]表示海面能见度________

  A．<0．1 km B．<1 km C．>1 km,<10 km D．<10 km

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• In Britain, when there is no fog, the use of fog lights is an offence, for ------receive a $ 30 fine.you may

  A．what B． which C． those D． that

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