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單項選擇題

My radar is not working.I require shore based radar assistance.Is shore based radar assistance（）?

A.used
B.available
C.in use
D.can be used

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單項選擇題

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

A.unwanted interference
B.unexpected figures
C.abnormal data
D.unwanted information

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