It may be found that，in certain circumstances，radar beacon emissions can cause ______ with the normal radar display，particularly at close range．

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• 1The productivity of working shifts can be improved through a decrease of ______.

  A.working hours

  B.gangs

  C.idle time

  D.weight per set

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• 2Mariners proceeding across the main routes are recommended to do so at ______.

  A.as wide an angle as practicable

  B.as wide an angle so practicable

  C.like wide an angle as practicable

  D.like wide as angle so practicable

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• 3Contour elevations on this chart refer to heights in feet above mean ______.

  A.lower low water

  B.high water

  C.low water

  D.sea level

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• 4Positions read from this chart should be moved 0．08 minutes Southward and 0．13 minutes Eastward so as ______ adjoining chart 3833．

  A.to agree upon

  B.in accordance with

  C.to be same as

  D.to agree with

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• 5A tide is called diurnal when ______.

  A.only one high and one low water occur during a lunar day

  B.the high tide is higher and the low tide is lower than usual

  C.the high tide and low tide are exactly six hours apart

  D.two high tides occur during a lunar day

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• 6Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with ______．

  A.ship's clock

  B.engine movement recorder

  C.repeaters

  D.navigation lights

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• 7In determining if risk of collision exists，such risk may sometimes exist even when an appreciable bearing change is evident，particularly when approaching ______．

  A.very large vessel

  B.a long tow

  C.a vessel at close range

  D.all A，B and C

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• 8I have pleasure in informing you that all safety equipment is in ______ working order．

  A.full

  B.care

  C.intentional

  D.reasonable

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• 9The abbreviation PPI in the Sperry Collision Avoidance System means ______．

  A.plan position indicator

  B.plain position indicator

  C.plane position indication

  D.policy proof of interest

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• 10Defense plans may cause the operation of electronic aids to navigation to be suspended with ______.

  A.no notice

  B.one day's notice

  C.a week's notice

  D.thirty (30) days notice

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